29-08-2017, 10:53 AM
The programmable counter array (PCA) present in the SST89E / V554RC and SST89E / V564RD is a special 16-bit timer that has five 16-bit capture / comparison modules. Each of the modules can be programmed to operate in one of four modes: up and down edge capture, software timer, high speed output or pulse width modulator. Module 4 can be programmed as a Watchdog timer in addition to the other four modes. Each module has an associated pin on port 1. Module 0 is connected to P1.3 (CEX0), module 1 to P1.4 (CEX1), module 2 to P1.5 (CEX2), module 3 to P1.6 (CEX3) and module 4 to P1.7 (CEX4).