User`s guide

Programming • 25
4
Programming
4.1 I/O Registers Format
The ACL-7120A occupies 16 consecutive addresses in the PC I/O address
space. Table 4.1 shows the I/O Map
Address Write Read
Base + 0 DO 0-7 DI 0-7
Base + 1 DO 8-15 DI 8-15
Base + 2 DO 16-23 DI 16-23
Base + 3 DO 24-31 DI 24-31
Base + 4 LSB OR MSB OF COUNTER 0
Base + 5 LSB OR MSB OF COUNTER 1
Base + 6 LSB OR MSB OF COUNTER 2
Base + 7 CONTROL BYTE CW0
Base + 8 LSB OR MSB OF COUNTER 3
Base + 9 LSB OR MSB OF COUNTER 4
Base + 10 LSB OR MSB OF COUNTER 5
Base + 11 CONTROL BYTE CW1
DO -- Digital Output
DI -- Digital Input
LSB -- Least Significant Byte
MSB -- Most Significant Byte
Table 4.1