Timer 1 and 2 operation , Timer 1 and 2 operation , PWM PrinciplesPWM Principles
Timer 1 OperationTimer 1 Operation
Timer 1 Control RegisterTimer 1 Control Register
Pulse Width Modulation (PWM)Pulse Width Modulation (PWM)
LHon
ave VT
tV *
Generating PWM signals in SoftwareGenerating PWM signals in Software
Generating PWM using HW Generating PWM using HW (1)(1)
Generating PWM using HW Generating PWM using HW (2)(2)
Timer 2 Block diagram Timer 2 Block diagram
Timer 2 Control RegisterTimer 2 Control Register
Capture, Compare, PWM Capture, Compare, PWM (CCP)(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 RegisterCCPxCON Register
Capture Mode OperationCapture Mode Operation
Compare Operation Compare Operation DiagramDiagram
PWM Operation DiagramPWM Operation Diagram
PWM Output at Pin RC2PWM Output at Pin RC2
PWM Calculations and PWM Calculations and SetupSetup