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PICDEM-1 User’s Guide
The next section of code performs the initialization of GPFLAG and PORTB.
Start
clrf
movlw
movwf
bsf
GPFLAG
B’00000000’
PORTB
STATUS, RP0
;clr all flags
;make port b outputs
clrf
bcf
TRISB
STATUS, RP0
;
/
After the initialization is completed the program goes into a loop where all
locations of the data EEPROM are written to and then read from for
verification. If all locations verify correctly, the value displayed on the LEDs is
incremented, if a mismatch between what was written and what is read is
found, the LEDs are blinked at a one Hertz rate.
Next
call
call
btfsc
goto
incf
goto
WriteAll
CheckAll
GPFLAG,EEPERROR
BlinkLeds
PORTB, F
Next
;write to all locations
;verify all locations
;no error then skip
;else blink leds.
;inc value in port b
WriteAll writes the value of what is displayed on the LEDs plus one to each
location of the EEPROM. Notice that the write enable bit, WREN , in the
EEPROM control register, EECON1 is set for the entire duration and does not
have to be re-enabled for each byte.
WriteAll
clrf
incf
movwf
bsf
bsf
bcf
WA1
call
incf
btfss
goto
bsf
bcf
bcf
return
DS33015C-page 28
EEADR
PORTB,W
EEDATA
STATUS,RP0
EECON1,WREN
STATUS,RP0
WriteOne
EEADR, F
EEADR,6
WA1
STATUS,RP0
EECON1,WREN
STATUS,RP0
;start at addr = 0
;read current value+1
;ld. data reg.
;select pg 1
;enable write operation
;select pg 0
;write to a location
;inc address
;all 64 done?
;no then do next
;pg 1
;disable write
;pg 0
? 1999 Microchip Technology Inc.
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