PIC16F18326 Interrupt error

[DirkB]

Hello,

I've noticed that on the PIC 16F18326, interrupts always trigger on both edges when a falling edge is set. This applies to the IOC and INT pins.

Regards

[mnfisher]

Can you post a simple demo showing this?

Looking at the datasheet - bits are set in IOCxP and IOCxN for rising and falling edge interrupts - both to detect both.

I added an IOC interrupt to a chart and selected some pins (the 'selection' image is too small - and I couldn't find keys to enlarge it) - then looking at the code generated:

Code: Select all

  // Interrupt
  st_bit(INTCON,GIE);
  IOCAP=0x28;
  IOCAN=0x18;
  IOCCP=0x0;
  IOCCN=0x0;
  st_bit(PIE0, IOCIE);

Which looks okay?

Martin

[DirkB]

Hi Martin,

these are exactly the entries (C code) in my interrupt handler. It works with other chips such as the 16F1825/27, the 18F14K22, and many others as well. You have to use a chip. In the simulation, it almost always works, even if it doesn't work on the chip.

[mnfisher]

I don't have that part to test with - sorry.
As a simple 'thought experiment' - can you add code to set the interrupt pins as 'inputs' before the interrupt icon? (set TRISA or use read a pin using input)
Set the pins to be 'digital' (set ANSELA)
Add a simple ISR that toggles a different pin.
Add a signal and let us know how the results look..

It's a long shot that the default values are different on this MCU for some reason?

Martin

[mnfisher]

Also to check that you are not trying to use a switch and just seeing 'bounce'?