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Chapter 5. EEPROM Demo – PIC16F84
WriteOne is where the actual writing of the EEPROM takes place. EEPROM
writes will not initiate if the proper sequence (write 55h to EECON2, write AAh
to EECON2, then set the WR bit) is not followed with exact timing. In order to
ensure this, interrupts have not been enabled. After the writing of the data,
and initiating the write sequence, the loop, W01 , waits for the WR bit to go low
indicating that the write has completed.
Note:
The timing in WriteOne is critical. Do not single step or do a soft-
ware trace through this routine.
WriteOne
WO1
bsf
movlw
movwf
movlw
movwf
bsf
btfsc
goto
bcf
STATUS,RP0
0x55
EECON2
0xaa
EECON2
EECON1,WR
EECON1,WR
WO1
STATUS,RP0
;page 1
;do write seq.
; /
; /
; /
;initiate write
;write complete?
;no then keep checking
;pg 0
return
Refer to PIC16F8X Data Sheet for EEPROM programming requirements.
CheckAll reads each location of the EEPROM and verifies that it matches
the value displayed on the LEDs plus one. If the value does not match, bit
EEPERROR of file register GPFLAG will be set and the routine will return
without verifying the other locations.
CheckAll
CA1
clrf
incf
EEADR
PORTB,W
;start at addr = 0
;ld. data to inspect
call
btfsc
return
incf
btfss
goto
CheckOne ;check location
GPFLAG,EEPERROR ;any error?
;yes then quit
EEADR, F ;inc address
EEADR,6 ;all 64 checked?
CA1 ;no then do next
return
CheckOne does the actual reading of the EEPROM byte and verifying that it
is correct. Although it is not necessary to check any flag bits during EEPROM
reads, they can be done immediately after setting the address in EEADR and
setting the read control bit ( RD EECON1<0> ), the RD bit will be cleared by the
hardware when the data has been placed in the EEDATA register. If there is a
verification error, the EEPERROR bit is set in the GPFLAG register.
? 1999 Microchip Technology Inc.
DS33015C-page 29
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