Timer 1 and 2 operation, PWM Principles. Timer 1 Operation.

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Presentation transcript:

Timer 1 and 2 operation, PWM Principles

Timer 1 Operation

Timer 1 Control Register

Pulse Width Modulation (PWM)

Generating PWM signals in Software

Generating PWM using HW (1)

Generating PWM using HW (2)

Timer 2 Block diagram

Timer 2 Control Register

Capture, Compare, PWM (CCP) There are two CCP modules in the 16F877. Each has two eight bit registers. They modules work in conjunction with either timer1 or timer2. They have three main modes of operation.

CCPxCON Register

Capture Mode Operation

Compare Operation Diagram

PWM Operation Diagram

PWM Output at Pin RC2

PWM Calculations and Setup