AXIOMTEK CAPA520 User Manual Download

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CAPA520 Intel

Core

Processor Family 3.5

” Board

Hardware Description

Chapter 3

Hardware Description

3.1

Microprocessors

The CAPA520 supports Intel

Core

i7/ i5/ i3/ Celeron

processors, which enable your

system to operate under 64-bit Windows

10 environments. The system performance depends

on the microprocessor. Make sure all correct settings are arranged for your installed
microprocessor to prevent the CPU from damages.

3.2

BIOS

The CAPA520

uses AMI Plug and Play BIOS with a single 256Mbit SPI Flash.

3.3

System Memory

The CAPA520 supports one 260-pin DDR4 SO-DIMM socket for maximum memory capacity
up to 32GB DDR4 SDRAMs. The memory module comes in sizes of 1GB, 2GB, 4GB , 8GB ,
16GB,and 32GB.

Summary of Contents for CAPA520

Page 1: ...CAPA520 8th 9th Generation Intel CoreTM Processor Family 3 5 Board User s Manual ...

Page 2: ... manual Axiomtek reserves the right to change or revise this document and or product at any time without notice No part of this document may be reproduced stored in a retrieval system or transmitted in any form or by any means electronic mechanical photocopying recording or otherwise without the prior written permission of Axiomtek Co Ltd CAUTION If you replace wrong batteries it causes the danger...

Page 3: ...e system unit chassis for a few seconds It discharges static electricity from your body Wear a wrist grounding strap available from most electronic component stores when handling boards and components Trademarks Acknowledgments Axiomtek is a trademark of Axiomtek Co Ltd Intel and Celeron are trademarks of Intel Corporation Windows is a trademark of Microsoft Corporation AMI is a trademark of Ameri...

Page 4: ...nector CN3 14 2 5 4 DisplayPort Connector CN4 15 2 5 5 Inverter Connector CN5 15 2 5 6 LVDS Connector CN6 16 2 5 7 Ethernet Ports CN7 and CN8 18 2 5 8 Ethernet Wafer Connector CN9 18 2 5 9 USB 3 0 Port CN10 19 2 5 10 USB 3 0 2 0 Port CN11 19 2 5 11 USB 2 0 Wafer Connector CN12 19 2 5 12 SATA Connectors CN13 and CN14 20 2 5 13 SATA Power Connector CN15 20 2 5 14 SATA Power Connector CN16 20 2 5 15 ...

Page 5: ...Memory Map 33 Chapter 4 AMI BIOS Setup Utility 35 4 1 Starting 35 4 2 Navigation Keys 35 4 3 Main Menu 37 4 4 Advanced Menu 38 4 5 Chipset Menu 54 4 6 Security Menu 59 4 7 Boot Menu 60 4 8 Save Exit Menu 61 Appendix A Watchdog Timer 63 A 1 About Watchdog Timer 63 A 2 How to Use Watchdog Timer 63 A 3 Sample Program 64 Appendix B Digital I O 67 B 1 About Digital I O 67 B 2 Digital I O Programming 67...

Page 6: ...vi This page is intentionally left blank ...

Page 7: ...various embedded computing solutions There is one 260 pin unbuffered SO DIMM socket for single channel DDR4 2666MHz memory supporting up to 32GB memory capacity It also features three Gigabit Fast Ethernet ports two SATA port with transfer rate up to 6Gb s three USB 3 0 and three USB 2 0 high speed compliant and built in HD audio codec that can achieve the best stability and reliability for indust...

Page 8: ... 8500T 6 core 2 1GHz i5 9500TE 6 core 2 2GHz Intel Core TM i3 8100T quad core 3 1GHz i3 9100TE quad 2 2GHz Intel Celeron processor G4900T dual code 2 9GHz Note SpeedStep might be functioned to minimize power draw and heat generation Chipset Intel H310 chipset Intel Q370 chipset optional Thermal Solution Active Operating Temperature 20 C 60 C BIOS American Megatrends Inc UEFI Unified Extensible Fir...

Page 9: ... Gigabit Fast Ethernet with Wake on LAN and PXE Boot ROM LAN2 Intel i211AT supports 1000 100 10Mbps Gigabit Fast Ethernet with Wake on LAN and PXE Boot ROM LAN3 Intel i211AT supports 1000 100 10Mbps Gigabit Fast Ethernet with Wake on LAN and PXE Boot ROM Audio HD audio link without codec 1x8 pin 1 0mm wafer HDA signal to support expansion audio board AX93A22 Expansion Interface One full size PCI E...

Page 10: ...CAPA520 Intel Core TM Processor Family 3 5 Board 4 Introduction 1 3 Utilities Chipset and graphics driver Ethernet driver Intel i211AT and i219LM Audio driver optional for AX93A22 ...

Page 11: ...CAPA520 Intel Core TM Processor Family 3 5 Board Board and Pin Assignments 5 Chapter 2 Board and Pin Assignments 2 1 Board Dimensions and Fixing Holes Top View ...

Page 12: ...CAPA520 Intel Core TM Processor Family 3 5 Board 6 Board and Pin Assignments Bottom View Side View ...

Page 13: ...CAPA520 Intel Core TM Processor Family 3 5 Board Board and Pin Assignments 7 2 2 Board Layout Top View Side View ...

Page 14: ...CAPA520 Intel Core TM Processor Family 3 5 Board 8 Board and Pin Assignments Bottom View ...

Page 15: ...mal grease on the processor and installing it on the socket please place heatsink and fan assembly on top of the processor Match the four screws to the fixing holes on the board Then screw tightly the heatsink and CPU fan assembly onto the board Note Be careful not to over tighten the screws as it can damage the processor or the CPU board Also make sure the fan cable is plugged to fan connector se...

Page 16: ...t up jumper Properly configure jumper and switch settings on the CAPA520 to meet your application purpose Below you can find a summary table of jumper switch and onboard default settings Note Once the default jumper or switch setting needs to be changed please do it under power off condition Jumper and Switch Description Setting JP1 LVDS 3 3V 5V 12V Voltage Selection Default 3 3V Level 1 2 Close S...

Page 17: ...e BIOS Optimal Defaults SW1 Use SW1 to clear CMOS Press the tact switch for at least 3 seconds to restore BIOS optimal defaults 2 4 3 Auto Power On SSW1 If SSW1 is enabled for power input the system will be automatically power on without pressing soft power button If SSW1 is disabled for power input it is necessary to manually press soft power button to power on the system Function Setting 12V lev...

Page 18: ...or CN3 HDMI Connector CN4 DisplayPort Connector CN5 Inverter Connector CN6 LVDS Connector CN7 CN8 Ethernet Port 1 and 2 CN9 Ethernet Port 3 Wafer Connector CN10 USB 3 0 Port CN11 USB 3 0 USB2 0 Port CN12 USB 2 0 Wafer Connector CN13 CN14 SATA 0 and 1 Ports CN15 CN16 SATA 0 and 1 Power Connectors CN17 COM1 Wafer Connector CN18 Fan Connector CN19 Digital I O Connector CN20 Audio HDA Wafer Connector ...

Page 19: ...on Pin 7 and 8 connect the power button on front panel to CPU board which allows users to turn on or off power System Reset Switch Pin 9 and 10 connect the case mounted reset switch that reboots your computer without turning off the power switch It is a better way to reboot your system for a longer life of system power supply HDD Activity LED This connection is linked to hard drive activity LED on...

Page 20: ...ation 2 5 3 HDMI Connector CN3 The HDMI High Definition Multimedia Interface is a compact digital interface which is capable of transmitting high definition video and high resolution audio over a single cable Pin Signal 1 CLK 2 DATA 3 GND Pin Signal Pin Signal 1 HDMI OUT_DATA2 2 GND 3 HDMI OUT_DATA2 4 HDMI OUT_DATA1 5 GND 6 HDMI OUT_DATA1 7 HDMI OUT_DATA0 8 GND 9 HDMI OUT_DATA0 10 HDMI OUT_Clock 1...

Page 21: ...ith Hirose DF13 8P 1 25V for inverter We strongly recommend you to use the matching connector DF13 8S 1 25C to avoid malfunction 8 1 Pin Signal 1 DPB_LANE0 2 GND 3 DPB_LANE0 4 DPB_LANE1 5 GND 6 DPB_LANE1 7 DPB_LANE2 8 GND 9 DPB_LANE2 10 DPB_LANE3 11 GND 12 DPB_LANE3 13 Detect Pin 14 GND 15 DPB_AUX 16 GND 17 DPB_AUX 18 DPB_HPD 19 GND 20 3 3V Pin Signal 1 VBL1 12V level 2 VBL1 12V level 3 VBL2 5V le...

Page 22: ...tion 2 4 1 Please note that when making LVDS cable the pin 2 of JST SHDR 40VS B connector should match the pin 1 of CN1 18 bit single channel Pin Signal Pin Signal 1 VCCM 2 VCCM 3 VCCM 4 VCCM 5 VCCM 6 VCCM 7 N C 8 N C 9 LVDS_HPD 10 GND 11 N C 12 N C 13 N C 14 N C 15 GND 16 GND 17 N C 18 N C 19 N C 20 N C 21 GND 22 GND 23 Channel A D0 24 N C 25 Channel A D0 26 N C 27 GND 28 GND 29 Channel A D1 30 N...

Page 23: ...B D2 27 GND 28 GND 27 GND 28 GND 29 Channel A D1 30 Channel A D3 29 Channel A D1 30 N C 31 Channel A D1 32 Channel A D3 31 Channel A D1 32 N C 33 GND 34 GND 33 GND 34 GND 35 Channel A D2 36 Channel A CLK 35 Channel A D2 36 Channel A CLK 37 Channel A D2 38 Channel A CLK 37 Channel A D2 38 Channel A CLK 39 GND 40 GND 39 GND 40 GND 24 bit dual channel Pin Signal Pin Signal 1 VCCM 2 VCCM 3 VCCM 4 VCCM...

Page 24: ...ort interface It is suggested to connect AX93287 IO board to have RJ 45 connector for Ethernet connection Pin 1000 Base T 100 10 Base T Description L1 BI_DA TX Bidirectional or Transmit Data L2 BI_DA TX Bidirectional or Transmit Data L3 BI_DB RX Bidirectional or Receive Data L4 BI_DC N C Bidirectional or Not Connected L5 BI_DC N C Bidirectional or Not Connected L6 BI_DB RX Bidirectional or Receive...

Page 25: ...e DF11 XDP 2DSA for installing versatile USB 2 0 compliant interface peripherals Pin Signal Pin Signal 1 USB_VCC 5V power 10 USB_VCC 5V power 2 USB_Data1 11 USB_Data2 3 USB_Data1 12 USB_Data2 4 GND 13 GND 5 SSRX1 14 SSRX2 6 SSRX1 15 SSRX2 7 GND 16 GND 8 SSTX1 17 SSTX2 9 SSTX1 18 SSTX2 Pin Signal Pin Signal 1 USB VCC 5V level 8 SSTX3 2 USB_Data3 9 SSTX3 3 USB_Data3 10 USB VCC 5V level 4 GND 11 USB_...

Page 26: ...es for connecting to devices such as hard disk drive s 2 5 13 SATA Power Connector CN15 The CN15 is a 1x4 pin pitch 2 0mm wafer and fully compliant with JST B4B PH K S 2 5 14 SATA Power Connector CN16 The CN16 is a 1x4 pin pitch 2 0mm wafer connector fully compliant with JST B4B PH K S Pin Signal 1 GND 2 SATA_TX 3 SATA_TX 4 GND 5 SATA_RX 6 SATA_RX 7 GND Pin Signal 1 12V level 2 GND 3 GND 4 5V leve...

Page 27: ...ion 4 4 2 5 17 Digital I O Connector CN19 This is a 1x10 pin pitch 1 0mm wafer connector fully compliant with JST BM10B SRSS TB This 8 channel digital I O meets requirements for a system customary automation control The digital I O can be configured to control cash drawers and sense warning signals from an Uninterrupted Power System UPS or perform store security control You may use software progra...

Page 28: ...se make sure all components and devices are properly installed before connecting the power connector The ATX1 is a 2x2 pin power input interface Follow the connector orientation to plug the external power supply Properly press down power supply plug until it completely and firmly fits into this connector Loose connection may cause system instability Note that ATX1 is co layout with 2x2 pin right a...

Page 29: ...B 3 No use 4 GND 5 No use 6 1 5V 7 CLKREQ 8 No use 9 GND 10 No use 11 REFCLK 12 No use 13 REFCLK 14 No use 15 GND 16 No use 17 No use 18 GND 19 No use 20 W_DISABLE 21 GND 22 PERST 23 PCIE5_RX_DP0 SATA2_RXN 24 3 3VSB 25 PCIE5_RX_DN0 SATA2_RXP 26 GND 27 GND 28 1 5V 29 GND 30 SMB_CLK 31 PCIE5_TX_DN0 SATA2_TXN 32 SMB_DATA 33 PCIE5_TX_DP0 SATA2_TXP 34 GND 35 GND 36 USB_Data8 37 GND 38 USB_Data8 39 3 3V...

Page 30: ... I O 5 VPP 6 GND Pin Signal Pin Signal A1 12V B1 GND A2 5VSB B2 GND A3 5VSB B3 GND A4 3 3VSB B4 GND A5 3 3VSB B5 RSVD A6 RSVD B6 RSVD A7 PWROK B7 RSVD A8 SMB_CLK B8 RSVD A9 SMB_DATA B9 GND A10 GND B10 PCI E TXP11 A11 PCI E RXP11 B11 PCI E TXN11 A12 PCI E RXN11 B12 WAKE_N A13 USBOC_N B13 PCI E CLKP A14 USB_Data6 B14 PCI E CLKN A15 USB_Data6 B15 GND A16 USB_Data7 B16 CLK_24M A17 USB_Data7 B17 SERIRQ...

Page 31: ...0 environments The system performance depends on the microprocessor Make sure all correct settings are arranged for your installed microprocessor to prevent the CPU from damages 3 2 BIOS The CAPA520 uses AMI Plug and Play BIOS with a single 256Mbit SPI Flash 3 3 System Memory The CAPA520 supports one 260 pin DDR4 SO DIMM socket for maximum memory capacity up to 32GB DDR4 SDRAMs The memory module c...

Page 32: ...CAPA520 Intel Core TM Processor Family 3 5 Board 26 Hardware Description 3 4 I O Port Address Map ...

Page 33: ...CAPA520 Intel Core TM Processor Family 3 5 Board Hardware Description 27 3 5 Interrupt Controller IRQ Map The interrupt controller IRQ mapping list is shown as follows ...

Page 34: ...CAPA520 Intel Core TM Processor Family 3 5 Board 28 Hardware Description ...

Page 35: ...CAPA520 Intel Core TM Processor Family 3 5 Board Hardware Description 29 ...

Page 36: ...CAPA520 Intel Core TM Processor Family 3 5 Board 30 Hardware Description ...

Page 37: ...CAPA520 Intel Core TM Processor Family 3 5 Board Hardware Description 31 ...

Page 38: ...CAPA520 Intel Core TM Processor Family 3 5 Board 32 Hardware Description ...

Page 39: ...CAPA520 Intel Core TM Processor Family 3 5 Board Hardware Description 33 3 6 Memory Map The memory mapping list is shown as follows ...

Page 40: ...CAPA520 Intel Core TM Processor Family 3 5 Board 34 Hardware Description This page is intentionally left blank ...

Page 41: ...in BIOS setup menu displays You can access the other setup screens from the main BIOS setup menu such as the Advanced and Chipset menus Note If your computer cannot boot after making and saving system changes with BIOS setup you can restore BIOS optimal defaults by setting SW1 see section 2 4 2 It is strongly recommended that you should avoid changing the chipset s defaults Both AMI and your syste...

Page 42: ...tup fields F1 The F1 key allows you to display the General Help screen F2 The F2 key allows you to Load Previous Values F3 The F3 key allows you to Load Optimized Defaults F4 The F4 key allows you to save any changes you have made and exit Setup Press the F4 key to save your changes Esc The Esc key allows you to discard any changes you have made and exit the Setup Press the Esc key to exit the set...

Page 43: ... up as described below The Main BIOS setup screen is shown below BIOS Information Display BIOS information System Date Time Use this option to change the system time and date Highlight System Time or System Date using the Arrow keys Enter new values through the keyboard Press the Tab key or the Arrow keys to move between fields The date must be entered in MM DD YY format The time is entered in HH ...

Page 44: ...ration of the CPU and other system devices You can select any of the items in the left frame of the screen to go to the sub menus F81803 Super IO Configuration Hardware Monitor ACPI Settings CPU Configuration SATA Configuration PCH FW Configuration USB Configuration Device Configuration For items marked with please press Enter for more options ...

Page 45: ...ect options for F81803 Super IO configuration and change the value of the selected option A description of the selected item appears on the right side of the screen For items marked with please press Enter for more options Serial Port 1 Configuration Use this item to set parameters related to serial port 1 see section 2 5 14 on CAPA520 ...

Page 46: ... Serial Port Enable or disable serial port 1 on CAPA520 The optimal setting for onboard F81803 SIO address is 3F8h and for interrupt request address is IRQ4 COM Port Type Use this item to set RS 232 422 485 communication mode Terminal Mode Enable the RS 422 485 termination resistor to enhance the signal ...

Page 47: ... monitors hardware health status This screen displays the temperature of system and CPU fan speed in RPM and system voltages 3 3VSB 5VSB and 3 3V 5V Smart Fan Function Enable or disable Smart Fan control function Once enabled you will be able to go further for Smart Fan Mode Configuration see image below ...

Page 48: ...APA520 Intel Core TM Processor Family 3 5 Board 42 AMI BIOS Setup Utility ACPI Settings ACPI Sleep State Select S3 Suspend to RAM as ACPI sleep state the system will enter when suspend button is pressed ...

Page 49: ...rtual Machine Mode can utilize the additional hardware capabilities It allows a platform to run multiple operating systems and applications independently hence enabling a single computer system to work as several virtual systems Intel SpeedStep TM The processor will control the frequency dynamically Turbo Mode Enable or disable processor Turbo Mode The processor can run up to maximum turbo frequen...

Page 50: ...ee the hardware currently installed in SATA ports SATA Controller s Enable or disable the SATA Controller feature The default is Enabled SATA Mode Selection Determine how SATA controller s operate Operation mode options are AHCI Advanced Host Controller Interface and Intel RST Premium with Intel Optane system Acceleration Note Only Q370 chipset can support Intel RST Premium with Intel Optane syste...

Page 51: ...APA520 Intel Core TM Processor Family 3 5 Board AMI BIOS Setup Utility 45 PCH FW Configuration This screen displays ME Firmware information USB Configuration USB Devices Display all detected USB devices ...

Page 52: ...s Enter for more options Onboard Device Configuration Use this option to configure onboard device e g Digital I O setting Module Device Configuration This option appears only if a ZIO module is installed BIOS will auto detect all supported functions and you can use it to change settings on the ZIO module The CAPA520 supports the following ZIO expansion modules AX93262 AX93285 AX93291 AX93295 and A...

Page 53: ... Enable or disable digital I O modification The default is Disabled Once it is enabled you can load manufacture default and access to the DIO status sub screen to set output or input Load Manufacture Default Use this option to load default settings DIO port 1 8 Select this option to open DIO status sub screen to set output or input for each port ...

Page 54: ...3 5 Board 48 AMI BIOS Setup Utility DIO port 1 8 Module Device Configuration Module Super IO Configuration This screen is available only if a ZIO module with serial ports is connected For items marked with please press Enter for more options ...

Page 55: ...ption A description of selected item appears on the right side of the screen For items marked with please press Enter for more options Serial Port 1 4 Configuration Set parameters related to serial port 1 4 on ZIO module Note The numbers of serial ports depends on which ZIO module is connected Once the Module Device Configuration is selected this screen will show the numbers of serial ports on tha...

Page 56: ... Setup Utility Serial Port 1 Configuration Serial Port Enable or disable serial port 1 on ZIO module The optimal setting for base I O address is 240h and for interrupt request address is IRQ10 COM Port Type Use this item to set RS 232 422 485 communication mode ...

Page 57: ...etup Utility 51 Serial Port 2 Configuration Serial Port Enable or disable serial port 2 on ZIO module The optimal setting for base I O address is 248h and for interrupt request address is IRQ3 COM Port Type Use this item to set RS 232 422 485 communication mode ...

Page 58: ...S Setup Utility Serial Port 3 Configuration Serial Port Enable or disable serial port 3 on ZIO module The optimal setting for base I O address is 250h and for interrupt request address is IRQ5 COM Port Type Use this item to set RS 232 422 485 communication mode ...

Page 59: ...etup Utility 53 Serial Port 4 Configuration Serial Port Enable or disable serial port 4 on ZIO module The optimal setting for base I O address is 258h and for interrupt request address is IRQ6 COM Port Type Use this item to set RS 232 422 485 communication mode ...

Page 60: ...Utility 4 5 Chipset Menu The Chipset menu allows users to change the advanced chipset settings You can select any of the items in the left frame of the screen to go to the sub menus System Agent SA Configuration For items marked with please press Enter for more options ...

Page 61: ...t SA Configuration This screen shows System Agent version information and provides function for specifying related parameters Graphics Configuration Use this item to open graphics configuration sub screen Memory Configuration Use this item to refer to information related to system memory ...

Page 62: ... Boot Display Select the video device which will be activated during POST Power On Self Test The default is GOP Default Secondary IGFX Boot Display When the Primary IGFX Boot Display is set a specific display instead of GOP Default Secondary IGFX Boot Display will be showed for selection ...

Page 63: ...3 5 Board AMI BIOS Setup Utility 57 LVDS Control Enable or disable LVDS Control LVDS Panel Type After LVDS control is enabled the LVDS Panel Type is showed for selection Select the appropriate LVDS panel resolution by options in image above ...

Page 64: ...tup Utility Brightness Setting After LVDS control is enabled the Brightness Setting is showed for selection It allows user to adjust the brightness level of the LVDS panel Range 0 255 Default 255 Memory Configuration This screen shows the system memory information ...

Page 65: ...cessor Family 3 5 Board AMI BIOS Setup Utility 59 4 6 Security Menu The Security menu allows users to change the security settings for the system Administrator Password Set administrator password User Password Set user password ...

Page 66: ...t Boot Select to display either POST output messages or a splash screen during boot up Launch UEFI PXE OpROM policy Use this item to enable or disable the boot ROM function of the onboard LAN chip when the system boots up Boot Option Priorities Boot Option 1 These are settings for boot priority Specify the boot device priority sequence from the available devices Boot Mode Use this option for boot ...

Page 67: ...he Save Exit menu and press Enter Select Yes to discard changes and exit Save Changes and Reset When you have completed the system configuration changes select this option to leave Setup and reboot the computer so the new system configuration parameters can take effect Select Save Changes and Reset from the Save Exit menu and press Enter Select Yes to save changes and reset Discard Changes and Res...

Page 68: ... settings when you select this option Select Restore Defaults from the Save Exit menu and press Enter Save as User Defaults Select this option to save system configuration changes done so far as User Defaults Select Save as User Defaults from the Save Exit menu and press Enter Restore User Defaults It automatically sets all Setup options to a complete set of User Defaults when you select this opti...

Page 69: ... initial value and must reset it periodically If the counter ever reaches zero which means the software has crashed the system will reboot A 2 How to Use Watchdog Timer The I O port base addresses of watchdog timer are 2E hex and 2F hex The 2E hex and 2F hex are address and data port respectively Assume that program A is put in a loop that must execute at least once every 10ms Initialize watchdog ...

Page 70: ... dx al Activate WDT mov dx 2Eh mov al 0F0h out dx al mov dx 2Fh mov al 80h out dx al Set base timer mov dx 2Eh mov al 0F6h out dx al mov dx 2Fh mov al Mh M 00h 01h FFh hex Value 0 to 255 out dx al see Note below Set Second or Minute mov dx 2Eh mov al 0F5h out dx al mov dx 2Fh mov al Nh N 71h or 79h see Note below out dx al Note If N 71h the time base is set to second M time value 00 Time out disab...

Page 71: ... 5 Board Watchdog Timer 65 If N 79h the time base is set to minute M time value 00 Time out disable 01 Time out occurs after 1 minute 02 Time out occurs after 2 minutes 03 Time out occurs after 3 minutes FFh Time out occurs after 255 minutes ...

Page 72: ...CAPA520 Intel Core TM Processor Family 3 5 Board 66 Watchdog Timer This page is intentionally left blank ...

Page 73: ...is up to 85mA Each DO can be up to 10mA at least B 2 Digital I O Programming I 2 C to GPIO PCA9554PW GPIO I 2 C address 01000100 Command byte Command Protocol Function 0 Read byte Input port register 1 Read write byte Output port register 2 Read write byte Polarity inversion register 3 Read write byte Configuration register The command byte is the first byte to follow the address byte during a wri...

Page 74: ... values in this register have no effect on pins defined as inputs Reads from this register return the value that is in the flip flop controlling the output selection not the actual pin value Register 1 Output port register bit description Bit Symbol Access Default Value Description 7 O7 R 1 Reflects outgoing logic levels of pins defined as outputs by Register 3 6 O6 R 1 5 O5 R 1 4 O4 R 1 3 O3 R 1 ...

Page 75: ...t in this register is cleared the corresponding port pin is enabled as an output At reset the I Os are configured as inputs with a weak pull up to VDD Register 3 Configuration register bit description Bit Symbol Access Default Value Description 7 C7 R W 1 Configures the directions of the I O pins 0 Corresponding port pin enabled as an output 1 Corresponding port pin configured as input default val...

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