After you get it writing & Reading, you need to be aware that there are
cases where the EEROM data seems to drop out on the PIC nanoWatt devices
after a few days.

I've had to write several copies of the data (plus checksum) and then
check the checksum before using the data, finding a GOOD copy of the
data, then overwite the bad copies.

Not sure what that is all about; only occurs on NanoWatt series parts...

--Bob

Jinx wrote:

>>  movfw al    ;my ptr counter
>>  movwf EEADR
>>  call rrs232
>>  bank1
>>  movwf  EEDATA
>>  bank0
>>  call  wr_ee
>
>
> EEADR (9B) and EEDATA (9A) are both in Bank1. If you're
> in Bank0 at "movwf EEADR" then you'll be writing to 1B
>
> You try this for writing
>
> write    bsf     eecon1,wren
>          movlw   0x55
>          movwf   eecon2
>          movlw   0xaa
>          movwf   eecon2
>          bsf     eecon1,wr
>          nop
>
> wrend    btfsc   eecon1,wr
>          goto    wrend
>          bank0
>
> --
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>


--

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       --------------
         Bob Axtell
PIC Hardware & Firmware Dev
   http://beam.to/baxtell
       1-520-219-2363

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