User`s guide

Registers Format
•
17
3
Registers Format
The chapter specifies the detailed descriptions of the register format.
This information is useful for the programmers who wish to handle
the card by low-level program.
3.1 Registers Address Map
The ACL-8111 requires 16 consecutive addresses in the I/O
address space. The following table (Table 3.1) shows the location of
each register relative to the base address and register descriptions.
Address Read Write
Base + 0 Counter 0 Counter 0
Base + 1 Counter 1 Counter 1
Base + 2 Counter 2 Counter 2
Base + 3 Not Used Counter Control
Base + 4 A/D low byte D/A low byte
Base + 5 A/D high byte D/A high byte
Base + 6 DI low byte Not Used
Base + 7 DI high byte Not Used
Base + 8 Not Used Clear Interrupt Request
Base + 9 Not Used Gain Control
Base + 10 Not Used Multiplexer Scan Control
Base + 11 Not Used Mode Control
Base + 12 Not Used Software A/D trigger
Base + 13 Not Used DO low byte
Base + 14 Not Used DO high byte
Base + 15 Not Used Not Used
Table 3.1 I/O Port Address Map