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

After reviewing Jon's code and considering that I expect pulses in the 0 tot 80 hz range, I think the slower the pulses, the more chance I will have of missing them, unless I set the DELAY_MS value large (say 800), in which case any other code in the MAIN routine might not get executed. Perhaps the external 7490 counter fed back through mcp23016 i/o expander chip would be more fool proof.

I had also thought of just interupting on every pulse and then calculating the time between pulses...but I needed the timer code for that and apparently RTCC is already in use. 

The extra (independant?) counters on the SX48 sound promising but I don't have any of those chips and they don't seem to come in DIP form so how would I test stuff out on my PDB/breadboard?

Is there an 7 seg LED that is bright enough to be seen in daylight?

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