sleep on 12f629

[sirvo]

hello.

I've looked for posts discussing @sleep on 12f629 but I got nothing (I did get, but nothing helpful). I would like to make 12f629 sleep an wake on gp3/!MCLR/Vpp change (on falling edge).

Is this possible ? How?

Thanks!

Sylvio

[skimask]

hello.

I've looked for posts discussing @sleep on 12f629 but I got nothing (I did get, but nothing helpful). I would like to make 12f629 sleep an wake on gp3/!MCLR/Vpp change (on falling edge).

Is this possible ? How?

Thanks!

Sylvio

How wide is this falling edge pulse?

Do you realize that a short low going pulse on the MCLR pin is the same as a reset and therefore can be used as a wake up signal?

Maybe use a 10K pullup on MCLR to Vdd, put your pulse into the MCLR pin itself thru a capacitor. As the pulse goes low, so does the cap, for a short period of time (depending on the size of the cap and the value of the pullup), then shortly later, the pullup resistor charges the cap back to Vdd...BAM...instant pulse generator...also, instant wake up...
Try it and see what happens. It's worked for me before.

[sirvo]

but i set MCLR_OFF
in my project gp3 is an input and it is connected trought the bc548 collector pin...
and the pulse takes around 1 second...
thanks...

[skimask]

but i set MCLR_OFF
in my project gp3 is an input and it is connected trought the bc548 collector pin...
and the pulse takes around 1 second...
thanks...

Well, MCLR is an input...of a sort...

[BGreen]

Did you use an interupt routine? can you post the code you used?

[sirvo]

Hi, here is all the code..:

@ DEVICE pic12F629, INTRC_OSC_NOCLKOUT ; System Clock Options
@ DEVICE pic12F629, WDT_OFF ; Watchdog Timer
@ DEVICE pic12F629, PWRT_ON ; Power-On Timer
@ DEVICE pic12F629, MCLR_OFF ; Master Clear Options (Internal)
@ DEVICE pic12F629, BOD_OFF ; Brown-Out Detect
@ DEVICE pic12F629, CPD_OFF ; Data Memory Code Protect
@ DEVICE pic12F629, PROTECT_OFF


Include "modedefs.bas"

IGNICAO VAR GPIO.0
IMOB VAR GPIO.1
PARTIDA VAR GPIO.2
AUX VAR GPIO.3
ALARME VAR GPIO.4

TEMPO VAR WORD 'time..
LOAD VAR WORD
CONT VAR BYTE

CMCON = 7
TRISIO = %00001000 'GPIO.3 INPUT ONLY
GPIO = 0
cont = 0
TEMPO = 0
LOAD = 55543
ALARME = 0

INTCON = %11000000 'enable interrupt
PIE1 = 1 'enable tmr1 overflow interrupt
On Interrupt Goto TE
TMR1L=load.lowbyte
TMR1H=load.highbyte

IN: PIR1.0 = 0 'tmr1 flag clear
if aux = 1 then
SELECT CASE cont
' CASE 0
' IF TEMPO = 3000 THEN
' SLEEP AND WAKE ON GPIO.3 FALLING EDGE
' GOTO IN
' ENDIF
CASE 1, 2
IF TEMPO = 1000 THEN
GOSUB RE
ENDIF
CASE 3
IF TEMPO = 6000 THEN
GOSUB RE
ENDIF
END SELECT
goto in
endif
BRANCH CONT, [E1, E2,E3,E4]

E1: PAUSE 100 ' THERE ARE THINGS DELETED INSIDE E1 - E4 LABELS
CONT = CONT + 1
T1CON = 1
GOTO IN

E2: PAUSE 100
CONT = CONT + 1
tempo = 0
T1CON = 1
GOTO IN

E3: PAUSE 100
CONT = CONT + 1
T1CON = 1
GOTO IN

E4: PAUSE 100
CONT = 0
T1CON = 0
GOTO IN

DISABLE
TE: tempo = tempo + 1
PIR1.0 = 0
TMR1L=load.lowbyte
TMR1H=load.highbyte
resume
ENABLE

RE: IGNICAO = 0
IMOB = 0
PARTIDA = 0
TEMPO = 0
CONT = 0
T1CON = 0
alarme = 0
RETURN

END

---------------------

so, take a look on label IN, CASE 0
i would like that to happen..

i think it's necessary to use a kind of an interrupt handler and check the flags.. but a i dont know what flags to check..

i think i'll need to set IOC.3 = 1 'enable gpio3 interrupt on pin chage

.....

i hope you help me.. sorry if that is too much..

thanks a lot..!

Sylvio

[Bruce]

If you just want to put the PIC to sleep, and wake up on keypress, you don't
need to enable global interrupts.

Here's something to start with.

@ DEVICE INTRC_OSC_NOCLKOUT,WDT_OFF,MCLR_OFF

DEFINE OSCCAL_1K 1

GIE     VAR INTCON.7  ' Global interrupt enable 1=ON, 0=OFF
GPIE    VAR INTCON.3  ' Port change interrupt enable 1=ON, 0=OFF
GPIF    VAR INTCON.0  ' Port Change Interrupt Flag bit
LED     VAR GPIO.0    ' LED output GND---/\/\/\---|<|--GPIO.0
Key     VAR GPIO.3    ' Key input (10K pull-up w/switch to ground)
X       VAR BYTE      ' G.P.

CMCON = 7             ' All digital
GPIO = 0              ' Clear port on boot
TRISIO = %00001000    ' GPIO.3 input, rest outputs

GIE = 0            ' Disable global ints
GPIE = 1           ' Enable port change int
IOC.3 = 1          ' Int-on-change for GPIO.3 enabled
X = GPIO           ' Take a snap shot of port on boot
	
Main:
    X = 10
    REPEAT
     TOGGLE LED        ' Toggle LED
     X = X - 1
     PAUSE 250
    UNTIL X = 0

    @ SLEEP            ' SLEEP until Key is pressed

    WHILE Key = 0      ' Wait for Key release
    WEND
	
    GPIF = 0           ' Clear port change interrupt flag
    GOTO Main
    END

You take it from here. Pretty much all you need is in the data sheet, and it's
simple to understand if you take your time...;o}

[sirvo]

hey Bruce, thanks!

That is what i was trying to get..
I'm going to update my code and then i'll post de results...

thank very much!

Sylvio