4 digital input registers, 5 digital output register – ADLINK ACL-8454/12 User Manual
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• Registers Format
3.4 Digital
Input
Registers
There are 16 digital input channels on the ACL-8454. The digital input
channels are common with the external gate signals (ExtG 1~3 & ExtG
7~10) and the external clock signals (ECLK 1~3 & ECLK 7~10).The
external clock source ECLK n and external gate control ExtG n can be read
back from the DI ports. When the external clock sources and the external
gate signals are not used for counters, these channels can be used as
digital input signal dedicatedly. For example, the chip #3 and #4 are not
installed under default configuration, ECLK7~10 and external gate
ExtG7~10 are not used hence the port (BASE+5) can be used as a digital
input port dedicatedly. Even if these external clock or gate signals are used
for counters, the input port can still monitor their signal level.
Address : BASE + 4 & BASE + 5
Attribute : read only
Data Format :
Bit
7
6
5
4
3
2
1
0
Base + 4
DI7 DI6 DI5 DI4 DI3 DI2 DI1 DI0
Base + 5
DI15 DI14 DI13 DI12 DI11 DI10 DI9 DI8
or
Bit
7
6
5
4
3
2
1
0
Base + 4
ExtG4 ExtG3 ExtG2 ExtG1 ECLK4 ECLK3 ECLK2 ECLK1
Base + 5
ExtG10 ExtG9 ExtG8 ExtG7 ECLK10 ECLK9 ECLK8 ECLK7
3.5 Digital
Output
Register
The register is a general purpose 8 bits digital output port. These signals
can be used to control external devices.
Address : BASE + 5
Attribute : write only
Data Format :
Bit
7
6
5
4
3
2
1
0
Base + 5
DO7 DO6 DO5 DO4 DO3 DO2 DO1
DO0