Hello,

Sorry about the lack of detail. I'm sending the data read from the EEPROM to an
LCD. I verified that data is written properly by reading the entire chip through
my programer. I've also inserted the address just before writing to EEADR: movlw
0x04 ect. and still I get data from 0x07. The chip is running @ 8MHz from the
internal RC.

My read routine:
EEPROM_read
 bcf    INTCON,GIE       ;debug ;interrupts off
 movf   EEPROM_ADD,w            ;save address in w
 bsf    STATUS,RP1              ;Bank2
 movwf  EEADR ^ 0x100           ;load EEPROM_Address
 bsf    STATUS,RP0              ;Bank3
 clrf   EECON1 ^ 0x180          ;point to data memory and clr WREN
 bsf    EECON1 ^ 0x180,RD       ;activate read
 bcf    STATUS,RP0              ;Bank2
 movf   EEDATA ^ 0x100,w        ;save data in w
 bsf    STATUS,RP0
 clrf   EECON1 ^ 0x180   ;debug ;drop read bit should be cleared by HW
 bcf    STATUS,RP0
 bcf    STATUS,RP1
 bsf    INTCON,GIE       ;debug ;ints off
 call   LCD_Data         ;debug ;Display what came out of eeprom
 return

Thx,
Steve


> Hi Steve,
>
> Are you at liberty to post some code? It's hard to say what is wrong
> without
> it.
> How are you "seeing" the data read from the EEPROM? Are you using an ICE,
> ICD, LCD, LEDs, serial port?
> Some more details would be helpful.
>
> Regards,
>
> Ken Pergola
>
>
>
>
> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of stesquib@MINES.EDU
> Sent: Saturday, August 09, 2003 4:28 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [PIC] internal EEPROM trouble
>
>
> Hello,
>
> I'm nearing the end of a project but having trouble with the final feature.
> this last feature writes and reads data from the internal EEPROM. I have
> verified that data is properly written to the EEPROM. But, no matter what
> address I try to read, I get the data stored in 0x07. I've verified the
> Issue on
> two seperate PIC16F819's and used the same routine on a 16F676. With proper
> bank
> changes the 676 version works fine. Any ideas about what I may be doing
> wrong?
>
> Always greatfull for any advice,
> Steve
>
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