Turn Microchip PIC16F6128 PWM On-Off Using PORT Register

by Lewis Loflin

Example code:

main
; remaining code goes here
	banksel TRISB ; goto bank 1
	bsf TRISB, 3
	call delay_500ms
	bcf TRISB, 3
	call delay_500ms
	goto	main 

For how to calculate frequency and duty cycle for PIC PWM
see Working with Pulse-Width Modulation and the PIC Microcontroller

Instead of writing 0 value to PWM counters to turn off the output we simply change the IO pin RB3 to input with TRISB bit RB3 in bank 1.

Download the ASM code 16F628A_PWM.asm.

See How I got into Electronics

• You Tube Videos for this Series
• Home Built PIC Development Board
• PIC16F628 PIC Using Rotary Encoder to Operate Stepper Motor
• Using a Serial ADC with PIC16F628
• Calculating Pulse-Width Modulation with a PIC
• PIC16F84A-628A Hardware Time Delays
• PIC16F84A-628A Timer Interrupt Delays
• PIC16F84A-628A Pullups and Interrupts
• PIC16F84A-628A Hardware Interrupts Tutorial

• Projects using PIC16F628:
• Home Built PIC16F628 Prototyping Board
• Exploring the Microchip PIC in Assembly
• Using a Microchip PIC with TLC548 Serial ADC
• Controlling PIC Pulse Width Modulation with a Serial ADC
• Using TMR0 on a PIC with Interrupts
• External Clock Crystal with PIC16F628 TMR1 Generates Interrupt
• PIC Using Rotary Encoder to Operate Stepper Motor
• PIC16F628 Pulse Width Modulation Controls Brightness of LED
• Another way to Turn On-Off PWM in a PIC
• TLC548 Serial ADC Spec. Sheet

• Programming PIC16F84A-PIC16F628A Interrupts by Example
• PIC16F84A-PIC16F628A Pull Up Resistors with Interrupts
• Programming PIC16F84A-PIC16f628a Timers by Example
• Programming PIC16F84A-PIC16F628A TMR0 Interrupts
• Programming PIC16F84A Software Delay Routines by Example

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