Advantech UNO-4672, User Manual

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33 Chapter 2
2.12.5 Counter Clock Source
There are two clock sources available for the user counters by setting
counter clock control bits - CTR0CLKSet and CTR1CLKSet.
2.12.6 Counter Internal Clock
There are four frequency options to choose according to applications, and
it’s set by internal clock control bits - S0 and S1.
2.12.7 Counter Gate Source
The gate sources you select determine what kind of gate input signal to
enable your counter/timer when receiving clock input. There are two gate
sources available for the user counters by setting gate source control bits -
CTR0GateSet and CTR1GateSet.
Table 2.20: Counter Clock Source Control Bit
CTR0CLKSet 0 Internal clock (default)
1 External clock from digital input 1 (DI1) channel
CTR1CLKSet 0 Internal clock (default)
1 External clock from digital input 3 (DI3) channel
Table 2.21: Counter Internal Clock Control Bit
S1 S0 Time base
0 0 100 KHz (default)
0 1 10 KHz
1 0 1 KHz
1 1 100 Hz
Table 2.22: Counter Gate Source Control Bit
CTR0GateSet 0 Gate source from “CTR0Gate” control bit (Default)
1 Gate source from digital input 0 (DI0) channel
CTR1GateSet 0 Gate source from “CTR1Gate” control bit (Default)
1 Gate source from digital input 2 (DI2) channel