12F675 - How to configure the INTCON command to activate the various interrupts?

[richard]

wasn't really happy with previous attempt

these are better one with dt ints one without

[zorgloub]

Hi, Richard,
I will carefully read your .txt files.
But I really only master Basic... not really ASM

[richard]

I will carefully read your .txt files.

not sure if I have to point out the obvious but
what sort of file would "ZORB.pbp.txt" if you took the ".txt" off the end ?
[the pbp forum will not allow a pbp file to be uploaded , you need to mask its type with a .txt extension]

But I really only master Basic... not really ASM

such a limited outlook

good luck employing interrupts in any other way with such limited chips as 12f675

[amgen]

" not sure if I have to point out the obvious" but you often have some degrading, demeaning cutting comment to people seeking help. Basically a reflection of yourself......

please delete this

[richard]

I will carefully read your .txt files.

i read that as either a lack of understanding on how files are uploaded onto the forum or
a intimation that i have uploaded something weird, unusual or incorrect. i don't know which
but either way since it was specifically pointed out an explanation was warranted

not sure if I have to point out the obvious but...

makes it clearer why the txt extension is there and how to deal with it, just in case an explanation was
necessary

but you often have some degrading, demeaning cutting comment to people seeking help. Basically a reflection of yourself......

really

[mpgmike]

To activate a single I/O pin as IOC (Interrupt on Change) you use the "IOC" Register; Register 3.4 in the Data Sheet:

IOC.0 = 1  'Enables IOC on GPIO 0

If you want to enable IOC interrupts on multiple GPIO pins you can use the IOC Register in binary mode. Assume you want an IOC Interrupt on GPIO pins 0 & 1:

IOC = 000011  'Enables IOC on GPIO 0 & 1

Then you must enable IOC interrupts using the INTCON Register:

INTCON.3 = 1  'Enables IOC Interrupts

Next, you need to create an Interrupt Handler (See PBP Manual) so when you get the Interrupt, you can do something with it. In your Interrupt Handler, when you get an IOC interrupt you have to clear the Interrupt Flag:

INTCON.0 = 0  'Clears IOC Interrupt Flag

If you need more than one GPIO IOC Interrupt (2 or more Port Pins), you will have to Poll which GPIO triggered the IOC Interrupt:

IF GPIO.0 = 1 THEN
  <Interrupt Handler Code for GPIO.0>
ELSE IF GPIO.1 = 1 THEN
  <Interrupt Handler Code for GPIO.1>
ENDIF

The above code assumes that a low-to-high transition triggers your IOC interrupt. You may need to change that depending on your goals.

<edit> I tried to write "IOC = 000011 'Enables IOC on GPIO 0 & 1" but the forum keeps changing it to "IOC = 000011 'Enables IOC on GPIO 0 & 1"

[richard]

Next, you need to create an Interrupt Handler (See PBP Manual) so when you get the Interrupt, you can do something with it. In your Interrupt Handler, when you get an IOC interrupt you have to clear the Interrupt Flag:

not forgetting :-


A mismatch condition will continue to set flag bit GPIF.
Reading GPIO will end the mismatch condition and
allow flag bit GPIF to be cleared.