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ZIRCON-MM

 User Manual v2.11 © 2002 Diamond Systems Corporation P. 10 

8. REGISTER DEFINITIONS 

 
 

Base + 0 or 1: D/A Register (Write only) 

 

Both these addresses map to the same physical register on the board. 
 

Bit 

7 

6 

5 

4 

3 

2 

1 

0 

Name 

D7 

D6 

D5 

D4 

D3 

D2 

D1 

D0 

 
 

D7 - D0

 8-bit digital value for output; D7 = most significant bit, D0 = least significant bit 

 

See 

Section 11

 for formulas to convert the desired output voltage to the corresponding input output 

code. 
 
 
 

Base + 0 or 1: A/D Register (Read only) 

 

Both these addresses map to the same physical register on the board. 
 

Bit 

7 

6 

5 

4 

3 

2 

1 

0 

Name 

A7 

A6 

A5 

A4 

A3 

A2 

A1 

A0 

 
 
A7 - A0 8-bit digital value from A/D; D7 = most significant bit, D0 = least significant bit 
 
See 

Section 10

 for formulas to convert this reading to the corresponding input voltage 

 

 
 

Base + 2 or 3: Start A/D Conversion (Write only) 

 

Both these addresses map to the same physical register on the board. 
Writing to this register starts an A/D conversion. The value written does not matter. 
 
 

Содержание ZIRCON-MM

Страница 1: ...lution Analog Digital I O PC 104 Module User Manual V2 11 Copyright 2002 Diamond Systems Corporation 8430 D Central Ave Newark CA 94560 Tel 510 456 7800 Fax 510 45 7878 techinfo diamondsystems com www...

Страница 2: ...der Pinout 4 3 Base Address Configuration 5 4 Interrupt Configuration 5 5 Analog I O Configuration 6 6 Zircon MM Board Drawing 8 7 Register Map 9 8 Register definitions 10 9 Digital I O Operation 13 1...

Страница 3: ...by an on board 4MHz clock oscillator The third counter timer is available at the I O header All I O lines are TTL and CMOS compatible ZIRCON MM is an 8 bit bus module and conforms to the physical and...

Страница 4: ...39 40 C0 B7 41 42 B6 B5 43 44 B4 B3 45 46 B2 B1 47 48 B0 5 Digital 49 50 Digital Gnd Definitions Analog In 7 0 Analog input channels range depends on configuration Analog Out Analog output channel ran...

Страница 5: ...ith header J6 located in the lower center of the board One position is used for the PC 104 1K pulldown resistor to enable interrupt sharing This resistor should be connected if interrupts are used Onl...

Страница 6: ...gative and positive input voltages and the analog output can create both negative and positive voltages The analog input range on this model can be set to 0 1 25V 0 2 5V or 0 5V in unipolar mode and 1...

Страница 7: ...further modified by the setting of D above B Bipolar range On ZMM DX installing a jumper in this position will configure the analog inputs and output for bipolar ranges depending on the position of D...

Страница 8: ...CON MM User Manual v2 11 2002 Diamond Systems Corporation P 8 6 ZIRCON MM BOARD DRAWING This drawing will help to locate various key features on the board as described in the configuration sections ab...

Страница 9: ...gital I O port B Digital I O port B 10 Digital I O port C Digital I O port C 11 Digital I O configuration register 12 Counter timer 0 data 82C54 Counter timer 0 data 13 Counter timer 1 data Counter ti...

Страница 10: ...ed output voltage to the corresponding input output code Base 0 or 1 A D Register Read only Both these addresses map to the same physical register on the board Bit 7 6 5 4 3 2 1 0 Name A7 A6 A5 A4 A3...

Страница 11: ...unter 2 output is not used Ch2 Ch0 A D channel select Ch2 Ch1 Ch0 Input channel 0 0 0 0 0 0 1 1 0 1 0 2 0 1 1 3 1 0 0 4 1 0 1 5 1 1 0 6 1 1 1 7 Base 4 or 5 Status register Read only Both these address...

Страница 12: ...ports as desired Bit No 7 6 5 4 3 2 1 0 Name 1 ModeC ModeA DirA DirCH ModeB DirB DirCL Definitions 1 Bit 7 must be set to 1 to indicate port mode set operation DirA Direction control for bits A7 A0 0...

Страница 13: ...output and each half of port C can be independently configured for input or output Output data is latched in the chip but input data is not latched When reading a port that is in input mode the curren...

Страница 14: ...mmed 16 bit value the divisor The formula for determining the output frequency of this counter pair is Output frequency 4Mz counter 2 divisor x counter 1 divisor The minimum divisor value for each cou...

Страница 15: ...g I O is limited to positive voltages 0 2 5V or 0 1 25V ranges On ZMM DX the analog circuitry is powered by an on board DC DC converter that provides dedicated 5 5 supplies to the board Using these su...

Страница 16: ...5mV Input voltage 5V x A D code 256 ZMM DX only 1 25V 9 8mV Input voltage 2 5V x A D code 256 ZMM DX only 0 5V 19 5mV Input voltage 5V x A D code 256 ZMM DX only 0 2 5V 9 8mV Input voltage 2 5V x A D...

Страница 17: ...ettling time 4 s max to 1 2 LSB Offset error 2 LSB max Full scale error 2 LSB max Output current 1 25mA max Digital I O No of lines 24 using 82C55 chip Compatibility TTL CMOS Pull up resistors 10K on...

Страница 18: ...compatible with the Harris 80C86 80C88 and 80C286 CMOS microprocessors along with many other industry standard processors Six programmable timer modes allow the 82C54 to be used as an event counter el...

Страница 19: ...28 Lead CLCC J28 A CM82C54 CM82C54 10 CM82C54 12 0oC to 70oC 24 Lead SOIC M24 3 Pin Description SYMBOL DIP PIN NUMBER TYPE DEFINITION D7 D0 1 8 I O DATA Bi directional three state data bus lines conn...

Страница 20: ...l signals for the other functional blocks of the 82C54 A1 and A0 select one of the three counters or the Con trol Word Register to be read from written into A low on the RD input tells the 82C54 that...

Страница 21: ...ontrol Logic to drive the inter nal bus This is how the 16 bit Counter communicates over the 8 bit internal bus Note that the CE itself cannot be read when ever you read the count it is the OL that is...

Страница 22: ...the A1 A0 inputs and each Control Word specifies the Counter it applies to SC0 SC1 bits no special instruction sequence is required Any programming sequence that follows the conventions above is accep...

Страница 23: ...ultiple Counter Latch Commands may be used to latch more than one Counter Each latched Counter s OL holds its count until read Counter Latch Commands do not affect the programmed Mode of the Counter i...

Страница 24: ...s been loaded into the counting element CE The exact time this happens depends on the Mode of the counter and is described in the Mode Definitions but until the counter is loaded into the counting ele...

Страница 25: ...l be loaded on the next CLK pulse and counting will continue from the new count If a two byte count is written the following happens 1 Writing the first byte disables counting Out is set low immediate...

Страница 26: ...reloads the initial count and the process is repeated Mode 2 is periodic the same sequence is repeated indefinitely For an initial count of N the sequence repeats every N CLK cycles GATE 1 enables cou...

Страница 27: ...ally high The initial count is loaded on one CLK pulse decremented by one on the next CLK pulse and then decremented by two on succeeding CLK pulses When the count expires OUT goes low and the Counter...

Страница 28: ...a Control Word is written to a Counter all Control Logic is immediately reset and OUT goes to a known initial state no CLK pulses are required for this Gate The GATE input is always sampled on the ris...

Страница 29: ...h the initial count and continues counting from there FIGURE 15 GATE PIN OPERATIONS SUMMARY FIGURE 16 MINIMUM AND MAXIMUM INITIAL COUNTS SIGNAL STATUS MODES LOW OR GOING LOW RISING HIGH 0 Disables Cou...

Страница 30: ...A 5 CP82C55A 40 Ld PDIP 0oC to 70oC E40 6 IP82C55A 5 IP82C55A 40oC to 85oC E40 6 CS82C55A 5 CS82C55A 44 Ld PLCC 0oC to 70oC N44 65 IS82C55A 5 IS82C55A 40oC to 85oC N44 65 CD82C55A 5 CD82C55A 40 Ld CER...

Страница 31: ...signal used by the CPU to load control words and data into the 82C55A A0 A1 8 9 I ADDRESS These input signals in conjunction with the RD and WR inputs control the selection of one of the three ports...

Страница 32: ...rent of 400 A Group A and Group B Controls The functional configuration of each port is programmed by the systems software In essence the CPU outputs a con trol word to the 82C55A The control word con...

Страница 33: ...input mode with no additional ini tialization required This eliminates the need to pullup or pull down resistors in all CMOS designs The control word register will contain 9Bh During the execution of...

Страница 34: ...d from port C can be inhibited or enabled by setting or resetting the associated INTE flip flop using the bit set reset function of port C This function allows the programmer to enable or disable a CP...

Страница 35: ...A0 OUTPUT 1 D7 0 D6 0 D5 0 D4 0 D3 0 D2 0 D1 0 D0 8 PA7 PA0 4 PC7 PC4 4 PC3 PC0 8 PB7 PB0 D7 D0 82C55A A B C 1 D7 0 D6 0 D5 0 D4 0 D3 0 D2 1 D1 0 D0 8 PA7 PA0 4 PC7 PC4 4 PC3 PC0 8 PB7 PB0 D7 D0 82C5...

Страница 36: ...3 0 D2 0 D1 1 D0 8 PA7 PA0 4 PC7 PC4 4 PC3 PC0 8 PB7 PB0 D7 D0 82C55A A B C 1 D7 0 D6 0 D5 1 D4 0 D3 0 D2 0 D1 1 D0 8 PA7 PA0 4 PC7 PC4 4 PC3 PC0 8 PB7 PB0 D7 D0 82C55A A B C 1 D7 0 D6 0 D5 0 D4 1 D3...

Страница 37: ...ndicates that the data has been loaded into the input latch in essence and acknowledg ment IBF is set by STB input being low and is reset by the rising edge of the RD input CONTROL WORD 12 CONTROL WOR...

Страница 38: ...data from Port A or Port B is ready to be accepted In essence a response from the peripheral device indicating that it is ready to accept data See Note 1 INTR Interrupt Request A high on this output c...

Страница 39: ...n this input enables the three state output buffer of port A to send out the data Oth erwise the output buffer will be in the high impedance state INTE 1 The INTE flip flop associated with OBF Con tro...

Страница 40: ...4 D3 D2 D1 D0 CONTROL WORD 1 0 1 0 1 1 0 PC2 PC0 1 INPUT 0 OUTPUT PORT B 1 INPUT 0 OUTPUT GROUP B MODE 0 MODE 0 1 MODE 1 PC7 OBFA PC6 INTE PA7 PA0 ACKA IBFA PC4 WR INTE RD PC3 PC5 PC2 PC0 1 2 8 STBA 3...

Страница 41: ...PB0 0 1 1 0 8 WR 1 D7 1 D6 D5 D4 D3 D2 D1 D0 CONTROL WORD PC7 8 STBA PA7 PA0 OBFA IBFA PC5 PC2 PC0 3 RD PC2 PC0 1 INPUT 0 OUTPUT ACKA PC6 INTRA PC3 I O PC4 PB7 PB0 0 0 1 0 8 WR 1 D7 1 D6 D5 D4 D3 D2 D...

Страница 42: ...to the correspond ing Port C bit positions of the ACK and STB lines with the Set Reset Port C Bit command will affect the Group A and Group B interrupt enable flags as illustrated in Figure 17 Current...

Страница 43: ...ware interface between the device and the CPU The functional definition of the 82C55A is programmed by the I O service routine and becomes an extension of the system software By examining the I O devi...

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