Help with Analog Interrupt

[Bruce]

Here's something to start with. I've converted the assembler example in the app note to PBP for you with one exception. It does not use interrupts. This just uses the ultra low-power wake-up feature to wake from sleep. Global interrupts are disabled.

With a 10K / 1uF RC network on RA0, it wakes up & toggles RC5 ~ once every 34 seconds.

@ device  pic16F688, intrc_osc_noclkout, wdt_off, mclr_off, protect_off
 ' Note: Default internal osc is set to 4MHz

SleepyTime: 
    'BCF STATUS, RP0 ;Bank 0
    'BSF PORTA, 0 ;Set RA0 data latch
     PORTA.0 = 1
     
    'MOVLW H’7’ ;Turn off
    'MOVWF CMCON0 ;comparators
     CMCON0 = 7
     
    'BSF STATUS, RP0 ;Bank 1
    'BCF ANSEL, 0 ;RA0 to digital I/O
     ANSEL.0 = 0
     
    'BCF TRISA, 0 ;Output high to
     TRISA.0 = 0
     
    'CALL CapDelay ;charge capacitor
     PAUSE 100 ' change to suite your RC circuit
     
    'BSF PCON, ULPWUE ;Enable ULP Wake-Up
     PCON.5 = 1
    
    'BSF IOCA, 0 ;Select RA0 IOC
     IOCA.0 = 1
    
    'BSF TRISA, 0 ;RA0 to input
     TRISA.0 = 1
     
    'MOVLW E’10001000’ ;Enable interrupt
    'MOVWF INTCON ;and clear flag
     INTCON = %00001000 ' Note bit 7 is clear since we're not vectoring to an int handler
     
    'SLEEP ;Wait for IOC
     @ SLEEP
     
     INTCON.0 = 0  ' clear int flag on wake-up

Main: ' Do whatever you need here on wakeup
     ' insert your code here
     
     TOGGLE PORTC.5  ' do your stuff here before entering sleep mode again
     GOTO SleepyTime ' do the ultra low-power wake-up thing again afterwards
     END

An interesting note on this one is that is works whether you clear the int flag or not!

[brid0030]

Above and beyond, Bruce. You are the greatest.