In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Zamuel_a wrote:

I have just started to experiment with the SX28 and I'm doing a project there I have a signal that is sent from a computer and I want to detect it with the SX28 so I made a poll loop for that pin (one of the RA pins) and it works if the frequency of the oscillator is low. If I run upto about 30MHz it seems to work, but if I connect a higher frequency oscillator it nearly never works. It's like it miss the input signal. Sometimes it works, sometimes not. First I thought it was the input signal that was to fast so I had to go up in frequency but the signal is about 200ns long so it should be plenty of time and the problem seems to be the opposite to what I thought! I need to go down in speed! I have tried most of the settings. SYNC/NO SYNC, INPUT PULL UP, CMOS/TTL inputs and I have the clock defined as HS3
I'm using the Parallax SX28AC

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