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Peak 550 User’s Guide

BIOS Setup 4-

Boot Up NumLock Status

The default value is On.

Keypad is number keys

Off

Keypad is arrow keys

Boot Up System Speed

It selects the default system speed - the speed that the system will run at
immediately after power up.

High

Set the speed to high

Low

Set the speed to low

Gate A20 Option

Normal

The A20 signal is controlled by keyboard controller
or chipset hardware.

Fast

Default : Fast. The A20 signal is controlled by Port
92 or chipset specific method.

Typematic Rate Setting

This determines the typematic rate.

Enabled

Enable typematic rate and typematic delay
programming

Disabled

Disable typematic rate and typematic delay
programming. The system BIOS will use default
value of this 2 items and the default is controlled by
keyboard.

Typematic Rate (Chars/Sec)

6 characters per second

8 characters per second

10 characters per second

12 characters per second

15 characters per second

20 characters per second

24 characters per second

Содержание Peak 550

Страница 1: ...Peak 550 PISA 550 Single Board Computer User s Guide All brand names are registered trademarks of their owners ...

Страница 2: ... information protected by copyright All rights are reserved No part of this manual may be reproduced by any mechanical electronic or other means in any form without prior written permission of the manufacturer Trademarks Peak 550 and PISA 550 are registered trademarks of Nexcom International Co Ltd IBM PC is a registered trademark of International Business Machines Corporation Intel and Pentium ar...

Страница 3: ...ter 4 Award BIOS Setup 4 1 Entering Setup 4 1 4 2 The Main Menu 4 4 4 3 Standard CMOS Setup 4 7 4 4 BIOS Features Setup 4 11 4 5 Chipset Features Setup 4 16 4 6 Power Management Setup 4 17 4 7 PCI On board I O setup 4 22 4 8 Integrated Peripherals 4 24 4 9 Password Setting 4 27 4 10 IDE Auto Detection 4 28 4 11 Hard Disk Low Level Format Utility 4 32 4 12 Power On Boot 4 34 4 13 BIOS Reference POS...

Страница 4: ...tors describes the definitions and positions of Jumpers and Connectors that you may easily configure and set up per your requirement Chapter 3 Capability Expanding describes how to change or expand the CPU Board by changing the system memory cache memory and CPU to get more power out from the CPU board Chapter 4 Award BIOS Setup describes how to use the advanced PCI Green BIOS to control almost ev...

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Страница 17: ...Peak 550 PISA 550 User s Guide B 3 3 4 3 3 4 A A 06 A 06 A 5 4D A 8 7D A 3D A 7D A 8 3D A D A D A 2 D A 2 A D A D A 2 D 06 9 D A D 06 D B 3 3 4 3 3 4 D 7 3 7 D D 5 50D A A A A A A A A ...

Страница 18: ...Peak 550 PISA 550 User s Guide B 3 3 4 9 91 1 9 9 A A0 9 9 9 H 9 9 5 95 B A7 3 3 4 9 A 3 0 A0 A0 A0 A0 C A0 0 B 3 3 3 4 3 3 C 3 3 C A ...

Страница 19: ...Peak 550 PISA 550 User s Guide B 8 50 6 3 3 4 06 A C 06 B 3 3 4 06 A C B 5 3 3 4 7 D C B 3 3 4 A C C B 55 9 6 3 3 1 1 C C 91 C 91 C A0 A0 ...

Страница 20: ...ingle In line Memory Modules on the CPU board The CPU board contains only one memory bank corresponding to connector SIMM1 and SIMM2 The table below shows possible SIMM configurations for the memory banks and the figure helps you correctly install the SIMM modules See Figure 3 2 for memory bank s location SIMM 1 SIMM 2 Total Memory 1MBit x 32 1MBit x 32 8MB 2MBit x 32 2MBit x 32 16MB 4MBit x 32 4M...

Страница 21: ...xpanding 3 2 The SIMM used could be either FP memory Fast Page Mode or EDO memory Extended Data Out For the FP memory the speed should be no slower than 70 ns Figure 3 1 Installing SIMM P54C Figure 3 2 Memory Banks FDC37C669 5598 SIMM 1 2 PBSRAM ...

Страница 22: ...r pull the CPU into or out from the socket Normally you have to use some tool to pull the CPU out from the socket To put on a new CPU please place the new CPU on the middle of the socket orienting its beveled corner to line up with the socket s beveled corner Make sure the pins of the CPU fit evenly to the socket openings then press the CPU until all the pins fit into the socket Be sure to re arra...

Страница 23: ...elow message appears briefly at the bottom of the screen during the POST Power On Self Test press Del key or simultaneously press Ctrl Alt and Esc keys TO ENTER SETUP BEFORE BOOT PRESS CTRL ALT ESC OR DEL KEY If the message disappears before you respond and you still wish to enter Setup restart the system to try again by turning it OFF then ON or pressing the RESET button on the system case You ma...

Страница 24: ...anges PgDn key Decrease the numeric value or make changes F1 key General help only for Status Page Setup Menu and Option Page Setup Menu Shift F2 key Change color from total 16 colors F2 to select color forward Shift F2 to select color backward F3 key Reserved F4 key Reserved F5 key Restore the previous CMOS value from CMOS only for Option Page Setup Menu F6 key Load the default CMOS value from BI...

Страница 25: ...e highlighted setup function is displayed at the bottom of the screen Status Page Setup Menu Option Page Setup Menu Press F1 to pop up a small help window that describes the appropriate keys to use and the possible selections for the highlighted item To exit the Help Window press F1 or Esc ...

Страница 26: ...09 CMOS SETUP UTILITY AWARD SOFTWARE INC STANDARD CMOS SETUP INTEGRATED PERIPHERALS BIOS FEATURES SETUP SUPERVISOR PASSWORD CHIPSET FEATURES SETUP USER PASSWORD POWER MANAGEMENT SETUP IDE HDD AUTO DETECTION PNP PCI CONFIGURATION HDD LOW LEVEL FORMAT LOAD BIOS DEFAULTS SAVE EXIT SETUP LOAD SETUP DEFAULTS EXIT WITHOUT SAVING Esc Quit Select Item F10 Save Exit Setup Shift F2 Change Color Time Date Ha...

Страница 27: ...Peak 550 User s Guide BIOS Setup 4 5 This setup page includes all the items of Award special enhanced features See Page 4 11 to Page 4 15 for details ...

Страница 28: ...ropriate value of the system parameter which the system would be in minimum performance The OEM manufacturer may change the defaults through MODBIN before the binary image burn into the ROM Load setup defaults Chipset defaults indicates the values required by the system for the maximum performance The OEM manufacturer may change to defaults through MODBIN before the binary image burn into the ROM ...

Страница 29: ...e hard disk parameters See Page 4 27 to Page 4 30 for details HDD low level format Hard disk low level format utility See Page 4 31 to Page 4 32 for details Save exit setup Save CMOS value changes to CMOS and exit setup Exit without save Abandon all CMOS value changes and exit setup ...

Страница 30: ...ss 00 00 00 HARD DISKS TYPE SIZE CYLS HEAD PRECOMP LANDE SECTOR MODE Primary Master Auto 0 0 0 0 0 0 AUTO Primary Slave Auto 0 0 0 0 0 0 AUTO Drive A 1 44M 3 5 in Base Memory 640K Drive B None Extended Memory 15360K Video EGA VGA Other Memory 384K Halt On All Errors Total Memory 16384K ESC Quit Select Item PU PD Modify F1 Help Shift F2 Change Color Date The date format is day date month year Press...

Страница 31: ...t work properly if you enter improper information for this category If your hard disk drive type is not matched or listed you can use Type User to define your own drive type manually If youselect Type User related information is asked to be entered to the following items Enter the information directly from the keyboard and press Enter This information should be provided in the documentation from y...

Страница 32: ...city Video The category selects the type of adapter used for the primary system monitor that must match your video display card and monitor Although secondary monitors are supported you do not have to select the type in Setup You have two ways to boot up the system 1 When VGA as primary and monochrome as secondary the selection of the video tape is VGA Mode 2 When monochrome as primary and VGA as ...

Страница 33: ...emory The category is display only which is determined by POST Power On Self Test of the BIOS Base Memory The POST of the BIOS will determine the amount of base or conventional memory installed in the system The value of the base memory is typically 512K for systems with 512K memory installed on the motherboard or 640K for systems with 640K or more memory installed on the motherboard Extended Memo...

Страница 34: ...Peak 550 User s Guide BIOS Setup 4 12 System total memory is the sum of basic memory extended memory and other memory ...

Страница 35: ...c 250 F1 Help PU PD Modify Security Option Setup F5 Old Values Shift F2 Color PCI VGA Palette Snoop Disable F6 Load BIOS Default OS Select For DRAM 64MB Non OS2 F7 Load Setup Default Virus Warning This category flashes on the screen During and after the system boots up any attempt to write to the boot sector or partition table of the hard disk drive will halt the system and the following error mes...

Страница 36: ...s during POST Enabled Enable quick POST Disabled Normal POST Boot Sequence This category determines which drive computer searches first for the disk operating system i e DOS Default value is A C C A System will first search for hard disk drive then floppy disk drive A C System will first search for floppy disk drive then hard disk drive Note This function is only available for IDE type For SCSI ty...

Страница 37: ...Peak 550 User s Guide BIOS Setup 4 15 Disabled BIOS will not search for the type of floppy disk drive by track number Note that there will not be any warning message if the drive installed is 360K ...

Страница 38: ...et hardware Fast Default Fast The A20 signal is controlled by Port 92 or chipset specific method Typematic Rate Setting This determines the typematic rate Enabled Enable typematic rate and typematic delay programming Disabled Disable typematic rate and typematic delay programming The system BIOS will use default value of this 2 items and the default is controlled by keyboard Typematic Rate Chars S...

Страница 39: ...tered at the prompt Setup The system will boot but access to Setup will be denied if the correct password is not entered at the prompt Note To disable security select PASSWORD SETTING at Main Menu and then you will be asked to enter password Do not type anything and just press Enter it will disable security Once the security is disabled the system will boot and you can enter Setup freely OS Select...

Страница 40: ... chipset Enabled Optional shadow is enabled Disabled Optional shadow is disabled Note 1 for C8000 DFFFF option ROM on PCI BIOS BIOS will automatically enable the shadow RAM User does not have to select the item 2 IDE second channel control Enable enable secondary IDE port and BIOS will assign IRQ15 for this port Disable disable secondary IDE port and IRQ15 is available for other device The item is...

Страница 41: ...Tag Bit Length 8 bits System BIOS Cacheable Enabled SRAM Back to Back Enable Video BIOS Cacheable Enabled NA Enable Enabled Memory Hole at 15M 16M Disabled Starting Point of Paging 1T VGA Shared Memory Size 1MB Refresh Cycle Time us 187 2 VGA Memory Clock MHz 55 RAS Pulse Width Refresh 6T RAS Precharge Time 4T RAS to CAS Delay 4T CAS Pulse Width FP 2T CAS Pulse Width EDO 1T RAMW Assertion Timing 3...

Страница 42: ...e IRQ 3 IRQ 9 IRQ 2 Redir Enabled Hot Key Power Off Disabled IRQ 10 Reserved Enabled PM Timers IRQ 11 Reserved Enabled HDD Off After Disable IRQ 12 PS 2 Mouse Enabled Doze Mode Disable IRQ 13 Coprocessor Enabled Standby Mode Disable IRQ 14 Hard Disk Enabled Suspend Mode Disable IRQ 15 Reserved Enabled ESC Quit Select item PM Events F1 Help PU PD Modify COM Ports Activity Enabled F5 Old Values Shif...

Страница 43: ...NDBY or SUSPEND Note If APM is installed if there is a task running even the timer is time out the APM will not prompt the BIOS to put the system into any power saving mode Note if APM is not installed this option has no effect C Video Off Method 1 Blank Screen The system BIOS will only blanks off the screen when disabling video 2 V H SYN C Blank In addition to 1 BIOS will also turn off the V SYNC...

Страница 44: ...ark 1 1 Disable System will never enter STANDBY mode 2 1 Min 2 Min 4 Min 6 Min 8 Min 10 Min 20 Min 30 Min 40 Min 1 Hr Defines the continuous idle time before the system entering STANDBY mode if any item defined in J is enabled active STANDBY timer will be reloaded Note Normally STANDBY mode puts the system into low speed or 8 MHz screen may be off depend on E G Suspend Mode Remark 1 1 Disable Syst...

Страница 45: ...Peak 550 User s Guide BIOS Setup 4 23 mode puts the system into low speed or 8 MHz clock is stopped screen may be off depend on E ...

Страница 46: ...end Default is off IRQ3 COM 2 IRQ4 COM 1 IRQ5 LPT 2 IRQ6 Floppy Disk IRQ7 LPT 1 IRQ8 RTC Alarm IRQ9 IRQ2 Redir IRQ10 Reserved IRQ11 Reserved IRQ12 PS 2 Mouse IRQ13 Coprocessor IRQ14 Hard Disk IRQ15 Reserved 2 ON The specified event s activity causes the PM Timers to be reloaded i e the Power Management Unit PMU monitors the specified activities as PM events Any input signals will wake the system u...

Страница 47: ...trongly recommended that only experienced users should make any changes to the default settings ROM PCI ISA BIOS 2A5IIN09 POWER MANAGEMENT SETUP AWARD SOFTWARE INC Resources Controlled by Manual PCI IRQ Actived By Level Reset Configuration Date Disabled PCI IDE IRQ Map To PCI AUTO IRQ 3 assigned to Legacy ISA Primary IDE INT A IRQ 4 assigned to Legacy ISA IRQ 5 assigned to PCI ISA PnP IRQ 7 assign...

Страница 48: ...unless you are using a Plug and Play operating system such as Windows 95 Choices are Auto and Manual default Reset Configuration Data This item allows you to determine reset the configuration data or not Choices are Enabled and Disabled default IRQ DMA Assigned To This item allows you to d etermine the IRQ DMA assigned to the ISA bus and is not available to any PCI slot Legacy ISA or PnP for both ...

Страница 49: ... controller changing this allows you to specify which slot has the controller and which PCI interrupt A B C or D is associated with the connected hard drives Remember that this setting refers to the hard disk drive itself rather than individual partitions Since each IDE controller supports two separate hard drives you can select the INT for each Again you will note that the primary has a lower int...

Страница 50: ... Parallel Port 278 IRQ5 Parallel Port Mode Normal ESC Quit Select Item PS 2 Mouse Function Enabled F1 Help PU PD Modify WDT Configuration Port F2h F5 Old Values Shift F2 Color F6 Load BIOS Defaults F7 Load Setup Defaults IDE HDD Block Mode This allows your hard disk controller to use the fast block mode to transfer data to and from your hard disk drive HDD Enabled IDE controller uses block mode Di...

Страница 51: ...nt and faster Your system supports five modes numbered from 0 default to 4 which primarily differ in timing When Auto is selected the BIOS will select the best available mode This is true for the next two setup items 1 IDE Primary Master PIO 2 IDE Primary Slave PIO On board FDC Controller Enabled no jumper setting is required On board UART 1 On board UART 2 The on board SIO 1 and SIO 2 could be se...

Страница 52: ...ional PIO on the add on card make sure to assign different address In the IBM PC compatible system 3 PIO in total are allowed to install On board Printer Mode The on board printer mode could be set as below Normal Default Extended EPP mode ECP mode ECP EPP ...

Страница 53: ...ort the selection and not enter a password To disable a password just press Enter when you are prompted to enter the password A message will confirm the password will be disabled Once the password is disabled the system will boot and you can enter Setup freely PASSWORD DISABLED When a password has been enabled you will be prompted to enter it every time you try to enter Setup This prevents an unau...

Страница 54: ...e HDD including NORMAL LBA LARGE if HDD does not support LBA modes no LBA option will be shown Users can select a mode which is appropriate for them ROM PCI ISA BOPS 2XXXXXXX CMOS SETUP UTILITY AWARD SOFTWARE INC II Standard CMOS Setup CYLS Heads Precom p Landzone Sector Mode Primary Master User 516MB 1120 16 65535 1119 59 Norma l Primary Slave None 203MB 684 16 65535 685 38 Select Primary Master ...

Страница 55: ...d sectors for NORMAL mode are 1024 16 63 no Cyclinder 1024 x no Head 16 x no Sector 63 x no per sector 512 528 Megabytes If user set his HDD to NORMAL mode the maximum accessible HDD size will be 528 Megabytes even though its physical size may be greater than that LBA Logical Block Addressing mode A new HDD accessing method to overcome the 528 Megabyte bottleneck The number of cylinders heads sect...

Страница 56: ...n some cases user do not want LBA The Award BIOS provides another alternative to support these kinds of HDD Example of LARGE mode CYLS HEADS SECTOR MODE 1120 16 59 NORMAL 560 32 59 LARGE BIOS tricks DOS or other OS that the number of cylinders is less than 1024 by dividing it by 2 At the same time the number of heads is multiplied by 2 A reverse transformation process will be made inside INT13h in...

Страница 57: ...LARGE mode of HDDs there must be some softwares involved All these softwares are located in the Award HDD Service Routine INT 13h It may be failed to access a HDD with LBA LARGE mode selected if you are running under a Operating System which replaces the whole INT 13h ...

Страница 58: ...lity SELECT DRIVE NO CYLS HEAD BAD TRACK LIST PREFORMAT Current select drive is C DRIVE C CYLINDER 0 HEAD 0 Size CYLS Head Precom p Landz Sector Mode Primary Master 0 0 0 0 0 0 AUTO Primary Slave 0 0 0 0 0 0 AUTO Up Down Select item ENTER Accept ESC Exit Abort Copyright C Award Software Inc 1992 94 All Rights Reserved Control Keys Use the Up and Down arrow keys to move around the selections displa...

Страница 59: ...Peak 550 User s Guide BIOS Setup 4 37 ...

Страница 60: ...t side of the screen Delete bad track Delete the added bad tracks in the window at the right side of the screen Clear bad track table Clear the whole bad track list in the window at the right side of the screen PREFORMAT Interleave Select the interleave number of the hard disk drive you wish to perform low level format You may select from 1 to 8 Check the documentation that came with the drive for...

Страница 61: ...system cannot boot with the CMOS values selected in Setup restart the system by turning it OFF then ON or Pressing the RESET button on the system case You may also restart by simultaneously press Ctrl Alt and Delete keys Upon restart the system immediately press Insert to load BIOS default CMOS value for boot up ...

Страница 62: ... has occurred and the BIOS cannot initialize the video screen to display any additional information This beep code consists of a single long beep followed by two short beeps Error Messages One or more of the following messages may be displayed if the BIOS detects an error during the POST This list includes messages for both the ISA and the EISA BIOS CMOS BATTERY HAS FAILED CMOS battery is no longe...

Страница 63: ...dicates the switch is set to a different setting than indicated in Setup Determine which setting is correct and then either turn off the system and change the jumper or enter Setup and change the VIDEO selection DISPLAY TYPE HAS CHANGED SINCE LAST BOOT Since last powering off the system the display adapter has been changed You must configure the system for the new display type EISA Configuration C...

Страница 64: ...ve selection in Setup is set to NONE Invalid EISA Configuration PLEASE RUN EISA CONFIGURATION UTILITY The non volatile memory containing EISA configuration information was programmed incorrectly or has become corrupt Re run EISA configuration utility to correctly program the memory NOTE When this error appears the system will boot in ISA mode which allows you to run the EISA Configuration Utility ...

Страница 65: ...g with your system s memory map to locate the bad chip OFFENDING ADDRESS NOT FOUND This message is used in conjunction with the I O CHANNEL CHECK and RAM PARITY ERROR messages when the segment that has caused the problem cannot be isolated OFFENDING SEGMENT This message is used in conjunction with the I O CHANNEL CHECK and RAM PARITY ERROR messages when the segment that has caused the problem has ...

Страница 66: ...d in the indicated slot NOTE When this error appears the system will boot in ISA mode which allows you to run the EISA Configuration Utility Slot Not Empty Indicates that a slot designated as empty by the EISA Configuration Utility actually contains a board NOTE When this error appears the system will boot in ISA mode which allows you to run the EISA Configuration Utility SYSTEM HALTED CTRL ALT DE...

Страница 67: ...ea including the compressed System BIOS Option ROMs C5 Copy the BIOS from ROM into E0000 FFFFF shadow RAM so that POST will go faster 01 02 Reserved 03 Initialize EISA registers EISA BIOS only 04 Reserved 05 1 Keyboard Controller Self Test 2 Enable Keyboard Interface 06 Reserved 07 Verifies CMOS s basic R W functionality BE Program defaults values into chipset according to the MODBINable Chipset D...

Страница 68: ...includes DMA controller 8237 Programmable Interrupt Controller 8259 Programmable Interval Timer 8254 RTC chip C1 Auto detection of onboard DRAM Cache C3 Checking checksum of compressed code C5 Copy the BIOS from ROM into E0000 FFFFF shadow RAM so that POST will go faster 01 Clear base memory 0 640K 0C Initial interrupt vector 00 1FH 0D Initial ISA VGA 41H Enable FDD and detect media type FFH Boot ...

Страница 69: ...OS s basic R W functionality BE Program defaults values into chipset according to the MODBINable Chipset Default Table C1 Auto detection of onboard DRAM Cache C5 Copy the BIOS from ROM into E0000 FFFFF shadow RAM so that POST will go faster 08 Test the first 256K DRAM 09 1 Program the configuration register of Cyrix CPU according to the MODBINable Cyrix Register Table 2 OEM specific cache initiali...

Страница 70: ... EGA VGA If no display device found the speaker will beep which consists of one single long beep followed by two short beeps 0E 1 Initialize the APIC Multi Processor BIOS only 2 Test video RAM If Monochrome display device found 3 Show messages including Award Logo Copyright string BIOS Date code Part No OEM specific sign on messages Energy Star Logo Green BIOS ONLY CPU brand type speed Test system...

Страница 71: ...Peak 550 User s Guide BIOS Setup 4 49 31 1 Test Base Memory from 256K to 640K 2 TestExtended Memory from 1M to the top of memory ...

Страница 72: ... Play BIOS Extension message PnP BIOS only 2 Program all onboard super I O chips if any including COM ports LPT ports FDD port according to setup value 33 3B Reserved 3C Set flag to allow users to enter CMOS Setup Utility 3D 1 Initialize Keyboard 2 Install PS2 mouse ...

Страница 73: ...there is any error detected such as video kb show a ll the error messages on the screen wait for user to press F1 key 4F 1 If password is needed ask for password 2 Clear the Energy Star Logo Green BIOS only 50 Write all CMOS values currently in the BIOS stack area back into the CMOS 51 Reserved 52 1 Initialize all ISA ROMs 2 Later PCI initializations PCI BIOS only assign IRQ to PCI devices initial...

Страница 74: ... 615 6 17 300 615 4 62 940 8 17 512 940 5 46 940 6 17 512 940 6 20 615 4 17 None 615 Seagate ST125 Tandon TM262 7 30 462 8 17 256 511 8 30 733 5 17 None 733 TandonTM703 9 112 900 15 17 None 901 10 20 820 3 17 None 820 11 35 855 5 17 None 855 12 49 855 7 17 None 855 13 20 306 8 17 128 319 Disctron 526 MMI M125 14 42 733 7 17 None 733 15 Reserved 16 20 612 4 17 0 663 Microscience HH725 Syquest 3250 ...

Страница 75: ...Peak 550 User s Guide BIOS Setup 4 53 21 42 733 7 17 300 732 22 30 306 5 17 300 733 Seagate ST4038 23 10 977 4 17 0 336 ...

Страница 76: ...ne 1023 Maxtor 1170 32 69 1024 9 17 None 926 CDC 9415 33 85 1024 10 17 None 1023 34 102 1024 12 17 None 1023 35 110 1024 13 17 None 1023 36 119 1024 14 17 None 1023 37 17 1024 2 17 None 1023 38 136 1024 16 17 None 1023 39 114 918 15 17 None 1023 Maxtor 1140 4380 40 40 820 6 17 None 820 SeagateST251 41 42 1024 5 17 None 1023 Seagate 4053 Miniscribe 3053 6053 42 65 1024 5 26 None 1023 Miniscribe 305...

Страница 77: ...2 Enabled for user s programming WDT Time out active for Reset Default at Reset NMI WDT Active Time 1 sec 2 sec 4 sec 8 sec 16 sec 32 sec 64 sec Default at 64sec You can program INDEX 7D in the CMOS RAM to read or change the set up information Example Read index 7D in the CMOS RAM MOV DX 70 MOV AL 7D OUT DX AL MOV DX 71 IN AL DX Write to index 7D in the CMOS RAM MOV DX 70 MOV AL 7D OUT DX AL MOV D...

Страница 78: ...101 Select 2 second 100 Select 4 second 011 Select 8 second 010 Select 16 second 001 Select 32 second 000 Select 64 second Watch dog Timer Programming Procedure Power on or reset the system The values of D4 D0 in port F2 are zero i e the watch dog timer is disabled Clear the WDT repeatedly read port F2 with the duration no longer than the preset time out interval otherwise the WDT will generate NM...

Страница 79: ...t intervals of WDT decide the values of D2 D1 D0 in F2 if you reset the system i e D2 D0 0 the time out interval will be 64 sec Select NMI or CPU reset decide D4 value in F2 or F6 if you just reset the system i e D4 0 then it s CPU reset Enable or disable WDT decide D3 value in F2 if you reset the system i e D3 0 it s disable You should build in a mechanism in the program to always read F2 to clea...

Страница 80: ...ect NMI d Enable WDT e Clear WDT f Disable WDT a Set RTC to generate WDT timer source SQW to generate 0 5 sec duty cycle timer source MOV AL 0A Set RTC output signal SQW to generate 0 5 sec cycling timer MOV DX 070 OUT DX AL MOV AL 2F MOV DX 071 OUT DX AL MOV AL 0B Enable SQW signal pin active MOV DX 070 OUT DX AL MOV AL 0A MOV DX 071 OUT DX AL ...

Страница 81: ...ect WDT for NMI or reset select NMI MOV DX 70 MOV AL 7D OUT DX AL MOV DX 71 IN AL DX OR AL 10 MOV DX 0F2 OUT DX AL MOV BL AL MOV DX 70 MOV AL 7D OUT DX AL MOV DX 71 MOV AL BL OUT DX AL d Enable WDT MOV DX 70 MOV AL 7D OUT DX AL MOV DX 71 IN AL DX OR AL 08 MOV DX 0F2 OUT DX AL MOV BL AL MOV DX 70 MOV AL 7D OUT DX AL MOV DX 71 MOV AL BL OUT DX AL ...

Страница 82: ... DX 70 MOV AL 7D OUT DX AL MOV DX 71 IN AL DX AND AL 0F7 OUT DX AL MOV BL AL MOV DX 70 MOV AL 7D OUT DX AL MOV DX 71 MOV AL BL OUT DX AL You can also combine programming procedure b c d with same subroutine for example set WDT 1 sec select NMI and go to enable WDT The instruction as followings MOV AL 01E Directly write to port F2 to set WDT 1 sec select NMI and Enable WDT MOV DX 0F2 OUT DX AL MOV ...

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