PIC microcontroller

Hey guys, I want to generate short duration pulses on three different pins of PIC16F877A. I want the total duration of pulses for 12us as follows:

The pulses on pin 1 and pin 2 will start at the same time, the pulse on pin 1 will stop at 6us whereas the pulse on pin2 will stop at 8us which marks the beginning of the pulse on the pin 3 which will last for 4us.

Thanks in advance.

A graphical illustration is attached below.

Easily doable in assembler, particularly if you use a 20MHz clock.

If this is the only task you're going to perform on the PIC than big-banging as Nigel suggests is the best way to go. For example, if running at 1 MHz (4 MHz FOSC) (RA0 as pin 1, RA1 as pin 2, RA2 as pin 3):



Otherwise, look at a PIC with at least 3 PWM cannels, such as PIC12F1501.