wake up from sleep

[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.

@ 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.

[savnik]

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.

@ 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.