wake up from sleep

I use pic16f628a with the code below.This code works.
I want to change the code , so the pic after 10 seconds to wake up for .1 sec and after go again to sleep

Code:

TRISB = %11110000 TRISA = %00000000 CMCON = 7 OPTION_REG.7=0 ' 0 = Enable PORTB Pull Ups @ Device wdt_off ' Disable the WatchDog Timer INTCON.3=1 ' Interrupt Control Register PORTB = 0 PORTA = 0 loop: PORTA.0 = 1 ' Turn LED On for 1 second pause 1000 PORTA.0 = 0 INTCON.0=0 @ SLEEP INTCON.0=0 goto loop

Hi Savnik,

The device can wake-up from SLEEP through one of the following events:
1. External RESET input on MCLR pin
2. Watchdog Timer wake-up (if WDT was enabled)
3. Interrupt from RB0/INT pin, RB Port change, or
any Peripheral Interrupt.

If you're not using option #1 or #3, then your left with the watchdog timer, but this has a
period of around 18mS without the prescaler, and 128 * 18mS with a prescaler set to 128.

OPTION_REG = %00001111 would assign the prescaler to the WDT, and give you roughly
2.304 seconds before each wake-up from @ SLEEP.

COUNTER=0 ' clear before entry
WHILE COUNTER < 4
@ SLEEP
COUNTER=COUNTER+1
WEND

Would give roughly 9.2 seconds before exiting the loop, but it's still going to wake-up every
2.304 seconds and increment COUNTER.

Quote:

Originally Posted by Bruce

Hi Savnik,

The device can wake-up from SLEEP through one of the following events:
1. External RESET input on MCLR pin
2. Watchdog Timer wake-up (if WDT was enabled)
3. Interrupt from RB0/INT pin, RB Port change, or
any Peripheral Interrupt.

If you're not using option #1 or #3, then your left with the watchdog timer, but this has a
period of around 18mS without the prescaler, and 128 * 18mS with a prescaler set to 128.

OPTION_REG = %00001111 would assign the prescaler to the WDT, and give you roughly
2.304 seconds before each wake-up from @ SLEEP.

COUNTER=0 ' clear before entry
WHILE COUNTER < 4
@ SLEEP
COUNTER=COUNTER+1
WEND

Would give roughly 9.2 seconds before exiting the loop, but it's still going to wake-up every
2.304 seconds and increment COUNTER.

I use Interrupt on RB4-7 Port change.
I have 4 button on rb4-7 , and if i push any button the pic wake up from sleep
and if i release the butoon the pic go again to sleep.
Now i want the pic every 10 seconds to wake up for .1 sec (without to push any button) and after go again to sleep.

Well, if you're not going to use the WDT, and you can spare RB6 and RB7, you could use a
32,768kHz crystal with Timer1.

Code:

@ DEVICE PIC16F628A,WDT_OFF,LVP_OFF,MCLR_OFF,INTRC_OSC,BOD_OFF DEFINE OSC 4 SYMBOL LED = PORTB.0 LED = 1 ' At POR, LED off after 1st toggle TRISB.0 = 0 ' LED pin an output TMR1H = $60 ' Pre-load TMR1 with $6001 TMR1L = $01 PIR1.0 = 0 ' Clear TMR1 overflow interrupt flag bit PIE1.0 = 1 ' TMR1 overflow interrupt enabled INTCON.6 = 1 ' Enable TMR1 peripheral interrupt T1CON = %00111111 ' External 32,768kHz crystal w\caps used, 1:8 prescale, TMR1 on Main: TOGGLE LED ' Indicates wake-up timing @ SLEEP ' Goto sleep (for ~9.999 seconds) T1CON.0 = 0 ' Stop TMR1 on overflow wake-up TMR1H = $60 ' Re-load TMR1 with $6001 TMR1L = $01 PIR1.0 = 0 ' Clear TMR1 over-flow int flag T1CON.0 = 1 ' Re-start TMR1 GOTO Main END

That would wake-up after sleep at roughly 10 second intervals without a button press. Do
whatever you need for the .1 sec, then go back to sleep.

Quote:

Originally Posted by Bruce

Well, if you're not going to use the WDT, and you can spare RB6 and RB7, you could use a
32,768kHz crystal with Timer1.

Code:

@ DEVICE PIC16F628A,WDT_OFF,LVP_OFF,MCLR_OFF,INTRC_OSC,BOD_OFF DEFINE OSC 4 SYMBOL LED = PORTB.0 LED = 1 ' At POR, LED off after 1st toggle TRISB.0 = 0 ' LED pin an output TMR1H = $60 ' Pre-load TMR1 with $6001 TMR1L = $01 PIR1.0 = 0 ' Clear TMR1 overflow interrupt flag bit PIE1.0 = 1 ' TMR1 overflow interrupt enabled INTCON.6 = 1 ' Enable TMR1 peripheral interrupt T1CON = %00111111 ' External 32,768kHz crystal w\caps used, 1:8 prescale, TMR1 on Main: TOGGLE LED ' Indicates wake-up timing @ SLEEP ' Goto sleep (for ~9.999 seconds) T1CON.0 = 0 ' Stop TMR1 on overflow wake-up TMR1H = $60 ' Re-load TMR1 with $6001 TMR1L = $01 PIR1.0 = 0 ' Clear TMR1 over-flow int flag T1CON.0 = 1 ' Re-start TMR1 GOTO Main END

That would wake-up after sleep at roughly 10 second intervals without a button press. Do
whatever you need for the .1 sec, then go back to sleep.

Thank you . I will try.