Onboard Isolated Counter/Timer; Counter/Timer Control Register - Advantech UNO-3072A User Manual

2.7 Onboard Isolated Counter/Timer

The UNO-3072A/3074A uses one 82C54 programmable timer/counter
chip that includes three independent 16-bit down counters: counter 0,
counter 1 and counter 2. Counter 0 and counter 1 are for users, and counter
2 is specified for the system and can't be used by user. Each counter has
clock input, gate input and pulse output. They can be programmed to
count from 2 up to 65535 or cascaded into one 32-bit counter.
The UNO-3072A/3074A has two isolated counter input channels desig-
nated DI1 and DI3 with two isolated output channels designated DO2 and
DO3. Therefore, you can set each counter of 82C54 as counter function or
timer function.

2.7.1 Counter/Timer Control Register

The Counter/Timer Control Register controls the function and status of
each counter/timer signal source. Table 2.19 shows the bit map of the
Counter/Timer Control Register. The register is readable/writable register.
While being written, it is used as a control register; and while being read,
it is used as a status register.
Table 2.8: Counter/Timer Control Register Bit Map
Base 7
Address
207H R/W Interrupt Flag/Clear Register
208H R/W 82C54 Chip Counter0 Register
209H R/W 82C54 Chip Counter1 Register
20BH R/W 82C54 Chip Control Register
20CH R/W Counter0 Start Control / Output Status Register
20DH R/W Counter1 Start Control / Output Status Register
20EH R/W Counter0 Setting Register
UNO-3072A/3074A User Manual
6 5 4
CTR0
Out
CTR1
Out
3 2
CTR1F CTR0F
CTR0 CTR0
IntSet OutSet
24
1 0
CTR0
Gate
CTR1
Gate
CTR0 CTR0
GateSet CLKSet