MPXM2102AS datasheet(555/670 Pages) MOTOROLA

555 / 670 page

AN1950

3–409

Motorola Sensor Device Data

www.motorola.com/semiconductors

rts

;__________________________________________________________

wrflash:

sthx

flshadr

;this is the address in the flash

sta

flshbyt

;and the byte we want to put there

FLASH:

tsx

sthx

memSP

;store SP in memSP, so it can be temporarily used as a 2nd index regis-

ter

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

;– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –

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

bsr

delayf

rts

delayf:

ldhx

#$0005

mov

#$36,tsc

;stop TIM & / 64

sthx

tmodh

;count H:X x 20us

bclr

5,tsc

;start clock

delayfls: brclr

7,tsc,delayfls

rts

lastbyt:

nop

;–––––––– GENERAL Routines ––––––––––––––––––––––––––––––––––––––––––

ALLINIT:

bset

0,config1

;disable COP

mov

#$38,ddra

;PTA0=MPAK,PTA1=SEL,PTA2=ENT,PTA3=E,PTA4=RS,PTA5=clk

bclr

3,porta

;E=0

bclr

4,porta

;grn=OFF; RS=0

bclr

5,porta

;red=OFF; CLK=0

mov

#$30,adiclk

;ADC clock /2

rts

;– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –

WARMUP:

bclr

4,porta

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

MPXM2102AS Datasheet(PDF) 555 Page - Motorola, Inc

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