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PWM, A Software Solution using the 16CXXX Devices

From Microchip Technology, Inc.
 

 
The low cost, high performance features of a PIC16CXXX microcontroller make it a suitable device for automatic control technology applications. Sometimes, an additional PWM output is needed. For some devices, such as the PIC16C71, the addition of a software PWM adds the missing element. It is possible to use Timer (which also provides the system clock) and its corresponding interrupt to generate a PWM output with a duty cycle that can vary from nearly 10% to 90%. However, some applications require a greater duty cycle range. This application note provides a software solution for a more accurate and flexible PWM output, which is characterized by the following: 1. PWM frequency up to 19.6 kHz (20 MHz crystal). 2. Variable duty cycle from 0% to 100%. 3. 8-bit resolution. 4. PWM step size of 1 TCY (Instruction Cycle Time). 5. Simultaneous generation of a system time clock.
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