I already mentioned in my topic that I have disabled the comparators from the PORTA pins. CMCON = oxo7 isalready set by me.
Any other sugestions?
I already mentioned in my topic that I have disabled the comparators from the PORTA pins. CMCON = oxo7 isalready set by me.
Any other sugestions?
I don't quite follow your code, but anyways, have you set the TRISA register to all 1's?
ie TRISA = 255
J
I developed a pulse reader application on a 16F84A.. worked well.
Needed the Timer1 function and compiled the code to a 16F628.
Setup the ports as follows:-
'Setup the hardware, define i/p and o/p
define osc 4
CMCON = 7 'turn comparators off
VRCON = 0
TRISB = 0 'set all PortB pins to outputs
TRISA = %00000111 'set RA0, RA1 & RA2 to input, all other outputs
I was using PortA1 for i/p and PortB4 for o/p on the 'F84A and after adding the CMCON and VRCON plugged in a 'F628 in lieu of the 'F84A.
Didn't work !!
Eventually, I found that if I reversed the i/p and o/p ports i.e PortA1 for o/p and PortB4 for i/p it worked.
TRISB = 1
TRISA = 0
My theory is that it is the Schmitt trigger on A0-A5 is causing the issue. Don't see how, as yet, as the i/p is a clean squarewave from a signal generator (am testing on the bench at the moment).
May give you a clue... and maybe someone has more info on this ?
Bookmarks