19.DIGITAL I/O OPERATION

Prometheus contains 24 digital I/O lines organized as three 8-bit I/O ports, A, B, and C. The direction for each port is programmable, and port C is further divided into two 4-bit halves, each with independent direction. The ports are accessed at registers Base + 8 through Base + 10 respectively, and the direction register is at Base + 11.

Base +

7

6

5

4

3

2

1

0

 

 

 

 

 

 

 

 

 

8

PA7

PA6

PA5

PA4

PA3

PA2

PA1

PA0

 

 

 

 

 

 

 

 

 

9

PB7

PB6

PB5

PB4

PB3

PB2

PB1

PB0

 

 

 

 

 

 

 

 

 

10

PC7

PC6

PC5

PC4

PC3

PC2

PC1

PC0

 

 

 

 

 

 

 

 

 

11

DIOCTR

 

 

DIRA

DIRCH

 

DIRB

DIRCL

 

 

 

 

 

 

 

 

 

The digital I/O lines are located at pins 1 through 24 on the I/O header J14 (see page 14). They are 3.3V and 5V logic compatible. Each output is capable of supplying –8mA in logic 1 state and +12mA in logic 0 state. See the specifications on page 62 for more detail.

DIRA, DIRB, DIRCH, and DIRCL control the direction of ports A, B, C4-7, and C0-3. A 0 means output and a 1 means input. All ports power up to input mode and the output registers are cleared to zero. When a port direction is changed to output, its output register is cleared to zero. When a port is in output mode, its value can be read back.

DIOCTR is used to control the function of lines C7-C4 on the I/O connector. When DIOCTR=1, the lines are C7-C4. When DIOCTR=0, these lines are counter/timer lines:

Pin No.

DIOCTR = 1

DIOCTR = 0

Pin direction for DIOCTR = 0

21

C4

Gate 0

Input

22

C5

Gate 1

Input

23

C6

Clk 1

Input

24

C7

Out 0

Output

Prometheus CPU User Manual V1.44

Page 58

Page 58
Image 58
Diamond Systems PR-Z32-EA-ST, PR-Z32-E-ST user manual Digital I/O Operation, Dioctr =

PR-Z32-E-ST, PR-Z32-EA-ST specifications

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