PIC 16f876 data eeprom write

[SuperBud]

I have a problem with data eeprom write routine. I use the routine in PIC's datasheet but pic doesn't esc of sleep mode.
Can you help me?

Thank you
SuperBud

 

[motion]

You might get responses if people could understand what you mean. Could you please explain your question a little bit clearer please.

 

[SuperBud]

This is the routine :
;---------------------------------------------
; the value to write is in variable sup
; the address si in register w
;--------------------------------------------
Scrivi_Dato
BSF STATUS, RP1
BCF STATUS, RP0 ; Bank 2
movwf EEADR ; EEADR<=w
Banksel sup
Movf sup,0 ;w<=sup
BSF STATUS, RP1
BCF STATUS, RP0 ; Bank 2
movwf EEDATA ;EEDATA<=w
BSF STATUS,RP0 ; Banco 3
BCF EECON1,EEPGD ;Punta alla Data Memory
BSF EECON1,WREN ;Abilito la scrittura

BCF INTCON,GIE ;Disabilita interrupt
movlw 55h
movwf EECON2
movlw 0AAh
movwf EECON2
BSF EECON1,WR ;Abilito scrittura
BSF INTCON,GIE ;Abilita interrupt

SLEEP
BCF EECON1,WREN ;Disabilito scrittura
Return

the program remains blocked on instruction SLEEP.
Excuse me for my bad English i hope that you can understand my problem and help me.
Thank you
Bye

 

[motion]

In addition to the global interrupt enable GIE, I think you need to enable EEIE bit in PIR2 to get an interrupt to come out of SLEEP. You also have to have an interrupt service routine at location 4 to clear the EEIF bit.

I don't use this routine myself. Since writing to the eeprom takes a long time, I simply return from this eeprom write routine and clear the WREN bit elsewhere. Anyway, a simpler routine instead of using SLEEP and interrupts is as follows:

WAIT:
    BTFSC    EECON1,WR
    GOTO     WAIT
    BCF      EECON1,WREN