Okay,  I'll  try this again...

To read from my EEPROM inside the 'F628 I put the desired EE address in w
and call 'ReadEE' (see code snippet).

I'll confirm the value in address 0x00 of the EE space equal to 0xAA, and
address 0x01 equal to 0x55 by looking at the EEPROM memory window.  If I run
at 4Mhz and read the two addresses one after the other, 'ReadEE' sends back
0xAA each time.  If I step through the program using the ICE2000, I'll get
the correct values: 0xAA, and 0x55.  What gives?

ReadEE
        BANK1
                movwf   EEADR                   ;Address to read
                bsf     EECON1,RD               ;EE Read
                movf    EEDATA,w                ;w = EEDATA
        BANK0
                return


Thanks,

Tim


Date:    Fri, 22 Feb 2002 15:25:34 -0500
From:    Olin Lathrop <olin_piclist@EMBEDINC.COM>
Subject: Re: [PIC]: 16F628 EEPROM revisited

> If I read EEADR 0x00 and store it in a register it equals AA.  Then if I
> read EEADR 0x01 and store it in a register it also equals AA.  If I step
> through the program, EEADR 0x01 = 55.  Just to test it, I put a 10uS delay
> between reads - no change.  Then I tried to read EEADR 0x00 then 0x04 - no
> change.

EEADR is just a RAM location in terms of reading/writing from the firmware.
If you write AA to it, you will read AA from it.  However, if have no idea
what you mean by the phrase "read EEADR 0x01" verus "read EEADR 0x00.  EEADR
is at a fixed address specified by Microchip, and you can't control the
value you *read* from a register, so this makes absolutely no sense to me.

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu