DT_INT Vs ASM - Round 1

[Megahertz]

Thanks Henrik. This explains a lot. I do not have an any device currently with me so I could not measure it at the moment.
Few things come to mind - What is the actual acceptable delay/error @ 2400 baud? Is it upto 20uS - 40uS that the transmission will not be affected? This would help, as I may use an higher oscillator, lets say 20MHz and bring down the latency if possible. Secondly, DT_INT also has assembly routine type interrupts, could you please check those for me, what is the latency there. If the way exists and all fits in, I would like to make this work using DT INT only without adding another PIC to handle the RF part.

[HenrikOlsson]

Hi,
Simply changing the interrupt declaration from type PBP to ASM makes the latency go from 7.4us to 2.7us (around 40 cycles) with the code in my previous post.
However, if you're going to use assembly interrupts I don't really see the need for DT-Ints. You can not use PBP statements in an interrupt routine declared as ASM (well it IS possible but it's very easy to screw things up and really not recommended).

I don't know what an acceptable error at 2400baud is OR how the bitbanged serial routines in PBP works when being interrupted like that. Apparently it does seem to work the way you currently have it. I guess one way for you to find out is to try.

/Henrik.