need help on special remote control

[sameh]

I want to build an infrared remote control using a low power & low voltage PIC because it will be powered by cr2032 lithium cell battery, 3V, the remote need to scan six button to detect which one is pressed and transmit the corresponding code, the code include a start bit which is around 300us followed by 5bit address followed by 4 bit data, then end bit, all bits are space coded, the mark has fixed width(around 6us) but start data and stop spaces have different width
my question is what is the best PIC that fit to this application, and how to code these pulse codes, maybe using timer and interrupt is the best way if I'm not wrong.
appreciate if someone refer me to similar application or available code
note:code format is not RC5, even is not modulated, instead, it is sent three times, with around 200ms gap