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

I seem to be struggling to get the comparitor function to work.  I am feeding pin B2 with a pulse that varies from 1.8 to 2.3 volts and feeding pin one with a voltage divider that gives me aproximately 2.1 volts.  I initialize the SX as follows:

 CMP  Con $08

 CmpEN $00

 Mode CMP

 Mov  !RB,CmpEn

 

I connect B6 to B0 with a resister and then monitor B6 in an interupt service routine. Do I have to continue issuing the Mode and Mov !RB instructions or is once enough?  I am not getting the pulse to come through even though I can feed the same pulses through a 741 OP am and get it to work as a comparitor. I need to use the compare function to eliminate some noise on the incoming pulse that is causing false triggering in the software.

 

Thanks

JIm

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