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bclr 4,porta
bclr 5,porta ;LEDs off
rts
;-------- WRITE TO EEPROM Routines ----------------------------------
; wrflash: burns A into flash at location pointed by H:X
; -------
wrflash: sthx flshadr
;this is the address in the flash
sta flshbyt ;and the byte we want to put there
tsx
sthx memSP ;store SP in memSP, so it can be temporarily used as a 2nd index register
ldhx #ramfree+1 ;SP now points to RAM (remember to add 1 to the address!!!, HC08 quirk)
txs ;SP changed (careful not to push or call subroutines)
ldhx #ersflsh ;H:X points to beginning of flash programming code
doall: lda 0,x ;get 1st byte from flash
sta 0,sp ;copy it into RAM
aix #$0001 ;HX:=HX+1
ais #$0001 ;SP:=SP+1
cphx #lastbyt
;and continue until we reach the last byte
bne doall
ldhx memSP ;once done, restore the SP
txs
jsr ramfree ;and run the subroutine from RAM, you cannot write the flash while
rts ;running a code in it, so the RAM has to take over for that piece
;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
;*************** THE FOLLOWING CODE WILL BE COPIED INTO AND WILL RUN FROM RAM ******
ersflsh: lda #$02 ;textbook way to erase flash
sta flcr
lda flbpr
clra
ldhx flshadr
sta 0,x
bsr delayf
lda #$0A
sta flcr
bsr delayf
lda #$08
sta flcr
bsr delayf
clra
sta flcr
bsr delayf
pgmflsh: lda #$01 ;textbook way to program flash
sta flcr
lda flbpr
clra
ldhx flshadr
sta 0,x
bsr delayf
lda #$09
sta flcr
bsr delayf
lda flshbyt
ldhx flshadr
sta 0,x
bsr delayf
lda #$08
sta flcr
bsr delayf
clra
sta flcr
AN1950
Sensors
18
Freescale Semiconductor
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