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

[zorgloub]

Good morning
As I am new to understanding and using Interrupts, could you explain to me the configuration of the INTCON command for a small PIC12F675?
The PBP manual gives as an example:
INTCON = %10010000 ' Enable RB0 interrupt
But I don't know for which PIC this command is valid (because I imagine it varies depending on the PIC used?).

Unless I am mistaken, the 6 ports of the PIC12F675 would make it possible to cause interrupts.
What would then be the commands to activate the various interrupts on GP0,1,2,3,4 and5 ?

Thanks all.

[richard]

But I don't know for which PIC this command is valid (because I imagine it varies depending on the PIC used?)

intcon is not a command, its a special function register
while the intcon reg is fairly similar in operation across the pic spectrum you need to always consult the data sheet for your chip
to ensure correct usage for the type/s of interrupt in question

the data sheet also has a section on interrupt types and how to configure them
the data sheet also will spell out how to save and restore mcu context to incorporate in your isr [interrupt service routine]code
the data sheet also has a section on ioc [int on change] for the gpio on that chip

What would then be the commands to activate the various interrupts on GP0,1,2,3,4 and5

there is no pbp command for that you need to set the appropriate registers yourself , properly of course

trisio,ioc, intcon

[zorgloub]

Indeed, INTCON is not strictly speaking a "command" but a configuration of the bits of the INTCON register obtained by a "line of code" of the style INTCON = 10010000.

I obviously consulted the datasheet of the PIC12F675 on the page relating to the INTCON register. (see attached jpg)
However, I do not see how to configure the six available ports.
At first, I would already be well advanced for my project if I could define an interrupt on the GP0 port.

For the others, we will see later with the assistance of the available specialists of this forum whom I already thank in advance.

[richard]

REGISTER 3-4: IOC: INTERRUPT-ON-CHANGE GPIO REGISTER (ADDRESS: 96h)

[zorgloub]

Hi,
In fact, I'm more of a PICAXE user and I transform my "simple" codes with PBP to program small PICs.
I was trying to use interrupts...
The subtleties of the PICs are therefore quite nebulous for me and my English is not flexible and subtle enough to understand the mysteries of the data sheets.
In fact what I wanted to do initially seemed easy to me... but it doesn't seem to be the case

I just want to vary a variable named MODE from 0 to 3, 0 to 3, ..., when port GP0 (which has a pull-up resistor to Vcc) goes to zero state.

If someone could help me out with just this little routine, that would be great.
Thanks in advance.

[richard]

'****************************************************************
'*  Name    : ioc-demo-12f675.BAS                               *
'*  Author  : richard                                           *
'*  Notice  : Copyright (c) 2023 caveat emptor                  *
'*          : All Rights Reserved                               *
'*  Date    : 22/04/2023                                        *
'*  Version : 1.0                                               *
'*  Notes   : 12f675 ioc gpio.0                                 *
'*          :                                                   *
'****************************************************************
#CONFIG
cfg = _INTRC_OSC_NOCLKOUT
cfg&= _WDT_ON
cfg&= _PWRTE_OFF
cfg&= _MCLRE_ON
cfg&= _BODEN_ON
cfg&= _CP_OFF
cfg&= _CPD_OFF
  __CONFIG cfg
#ENDCONFIG
DEFINE INTHAND    poll
wsave VAR BYTE    $20     SYSTEM      
ssave VAR BYTE    BANK0   SYSTEM     


mode  var byte
DUMMY VAR BYTE


INPT  VAR GPIO.0
LED   VAR GPIO.1


cmcon = 7
ANSEL = 0
TRISIO.0 = 1
TRISIO.1 = 0
IOC.0 = 1




MODE = 3      
DUMMY = GPIO
INTCON = 001000
LED = 1


MAIN:
    IF  ! MODE THEN
        LED = 0
        pause 1000
        LED = 1
        mode = 3
        DUMMY = GPIO
        INTCON = 001000
    endif 
    PAUSE 10
GOTO MAIN




asm
poll
    MOVWF wsave 
    SWAPF STATUS,W 
    BCF STATUS,RP0 
    MOVWF ssave 
    
    BANKSEL _mode
    clrf _mode    
    
    SWAPF ssave,W
    MOVWF STATUS 
    SWAPF wsave,F 
    SWAPF wsave,W 
ENDASM

[zorgloub]

Thank you all.
I will try to assimilate all these notions.
Have a good day.