Electro Tech forum,
I can't figure out the problem with the attached circuit.
Sorry about the drawing I don't have a schematic program.
4050 is a buffer
4040 is a 12 bit ripple counter
4518 is a decade counter
16F88 is a pic
All the circuit does is divide the 60HZ by 512 and the reset
is used to clock the 4518 and Q1 blinks the led. This works
fine.
Then I use the reset as an external interrupt for the 16F88.
Doesn't work. BUT! if I just wire pin 11 of the 4518 to
the interrupt pin(RB5) the 16F88 diode blinks according to
my program.
I can't seem to trigger on this reset with my analog scope.
I tried wiring the reset through a buffer but it didn't help.
jerryd
I can't figure out the problem with the attached circuit.
Sorry about the drawing I don't have a schematic program.
4050 is a buffer
4040 is a 12 bit ripple counter
4518 is a decade counter
16F88 is a pic
All the circuit does is divide the 60HZ by 512 and the reset
is used to clock the 4518 and Q1 blinks the led. This works
fine.
Then I use the reset as an external interrupt for the 16F88.
Doesn't work. BUT! if I just wire pin 11 of the 4518 to
the interrupt pin(RB5) the 16F88 diode blinks according to
my program.
I can't seem to trigger on this reset with my analog scope.
I tried wiring the reset through a buffer but it didn't help.
jerryd