Question: What is the difference between Counter and PWM user modules in PSoC1?
Answer: In hardware, there is no difference between a Counter and a PWM. Both are implemented by configuring a digital block as a counter. The difference is only in the name of the user modules and the APIs. In PWM, the APIs are named with respect to the functions of a PWM and in Counter, the APIs are named after functions of a Counter.
You can implement a PWM by placing a Counter user module and bringing out the Compare Out signal of the counter. The pulsewidth may be modified by calling the Counter_WriteCompareValue API which is the same as the WritePulseWidth API of a PWM.