Hello!

Further IR demodulator tests, and I have decided to use a standard TV remote as a type of remote control for my 8051 system.

Noting the IR demodulator systems for remote controls use the manchester encoding scheme (the start bit is 2.62msec low, a 1 pulse is .79msec, and a 0 pulse is a 1.33msec pulse; both actively low) how would one go about detecting the length of the pulses?

I have the demodulator data pin connected to INT5 of the Dallas ds89c420 IC. I'd be looking for some code that detects a low and triggers an interupt routine. While I'm confident in being able to figure this part of it out, my 8051 book is not very easy to understand as far as timing delays are concerned. The forumula is there, but its difficult. Does anyone know of perhaps an online java based timing delay calculator for 8051s?

I've found some C++ examples of code to decode the pulses, but im trying to do it in ASM. Does anyone have any ideas? (I use the 11.0592Mhz crystal)

As always, thanks in advance.