10F222 wake/sleep

Ladies and Gents,

I've been playing around with the 10F222 and its sleep/wake on pin change. Not trying to show my ineptness here but what do they mean by reading the input pins? This code works:

Code:

---

CLEAR
DEFINE OSC 4
adcon0 = 0        ' Turn off ADC
option_reg = %00001000      ' enable wake on pin, weak pull ups, prescaler to wdt       
osccal = %00000000            ' oscillator calibration
trisio = %1101      ' GP1 only is output
gpio = 0 ' turn everything off

LED VAR gpio.1
i VAR BYTE

start_here:

IF gpio.0 = 0 THEN GOSUB Light_LED
IF gpio.3 = 0 THEN GOSUB Light_LED
SLEEP 5

GOTO start_here

Light_LED:
i = 0
    FOR i = 0 TO 3
    TOGGLE LED
    PAUSE 8000
    NEXT i
RETURN

END

---

I'd like to know if I did it right or is there something more subtle, or bodacious, I should be doing.

I've, I think, attached the page and my code. Constructive help greatly appreciated.

Hi AvionicsMaster

Here is a code using IOC and Sleep.

Code:

---

'****************************************************************
'*  Name    : Temporizador 3m p/ Lavar Dentes.BAS              *
'*  Author  : Hugo Oliveira                                    *
'*  Notice  : Copyright (c) 2012 ProSystems                    *
'*          : All Rights Reserved                              *
'*  Date    : 01-03-2012                                        *
'*  Version : 1.0                                              *
'*  Notes  : Proteus + Circuito com SOT-23 e CR2032            *
'*          : 10F222 - Wake from sleep através de IOC no GP3    *
'****************************************************************
@ __config _IOFSCS_4MHZ & _WDT_OFF & _MCLRE_OFF & _CP_OFF & _MCPU_ON

 DEFINE OSC 4

 '===================SRF AND PINOUT CONFIGURATION - 1-In / 0-Out=================
              '76543210
    TRISIO = %00001000
      GPIO = %00000000
 OPTION_REG = %00000000 'OPTION_REG.7 - Wake on change bit 0=Enable
    ADCON0 = %00000000 'Analog pins disable

'==================================ALIAS========================================
 VAZIO1 VAR GPIO.0
 VAZIO2 VAR GPIO.1
 LED    VAR GPIO.2
 MCLR  vAR GPIO.3
 
'=================================VARIABLES=====================================
 I VAR BYTE
 
'================================MAIN LOOP======================================
@ movlw 0x01A  ;OSCCAL Value
@ movwf OSCCAL
Main:


 WHILE MCLR = 0
 WEND
 
 FOR I = 0 TO 119 '~120 Segundos a Piscar de 1 em 1 Segundo
    HIGH LED
    PAUSE 500
    LOW LED
    PAUSE 500
 NEXT

 FOR I = 0 TO 59  '~30 Segundos a Piscar de 0,5 em 0,5 Segundo
    HIGH LED
    PAUSE 250
    LOW LED
    PAUSE 250
 NEXT

 HIGH LED
 PAUSE 30000    '~30 Segundos sempre ligado
 LOW LED
 'Sequencia de finalização
 HIGH LED: PAUSE 100: LOW LED: PAUSE 100
 HIGH LED: PAUSE 100: LOW LED: PAUSE 100
 HIGH LED: PAUSE 100: LOW LED: PAUSE 100
 
 I = GPIO    'Must read GPIO before entering sleep. Read the Datasheet
@ SLEEP
@ NOP
GOTO Main
END

---

Hi,
There's a slight difference between the PBP command SLEEP and the ASM instruction SLEEP.

The PBP command uses the ASM instruction sleep but relies on the watchdog timer to periodically wake the PIC up in order to keep track of time. If you don't want the PIC to periodcally wake up you need to disable the watchdog and use the ASM instruction SLEEP directly.

What they mean by "reading the pins" is that before entering sleep mode you should make a "dummy read" of the pins in order to clear any mismatch which might otherwise cause the PIC to wake right back up.

/Henrik.

On some PIC chips there is an option in Config Word that allows the WDT to be enabled when PIC is running and automatically disabled when it enteres SLEEP (in ASM command, not PBP sleep).

For example 16F1826/27. See page 44 of the datasheet at http://ww1.microchip.com/downloads/e...Doc/41391D.pdf

Ioannis