EEPROM Question

[Jeff]

I would like to place some data in the EEPROM of a PIC16F628 during programming. In the latest manual, the #ROM directive sounds like this is possible.

The brief example in the manual shows the following for a '84:
#rom 0x2100={1,2,3,4,5,6,7,8}

I've checked the '84 datasheet and don't understand how the 0x2100 address was derived (and what part of the EEPROM this actually is). I know when writing and reading to the data EEPROM, indirect addressing is used.

First of all, is this possible?
Second, where would I find the information for the direct EEPROM addresses for the PIC16F62x?

Thanks for any help,
Jeff
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This message was ported from CCS's old forum
Original Post ID: 1143

[chas]

:=I would like to place some data in the EEPROM of a PIC16F628 during programming. In the latest manual, the #ROM directive sounds like this is possible.
:=
:=The brief example in the manual shows the following for a '84:
:=#rom 0x2100={1,2,3,4,5,6,7,8}
:=
:=I've checked the '84 datasheet and don't understand how the 0x2100 address was derived (and what part of the EEPROM this actually is). I know when writing and reading to the data EEPROM, indirect addressing is used.
:=
:=First of all, is this possible?
:=Second, where would I find the information for the direct EEPROM addresses for the PIC16F62x?
:=
:=Thanks for any help,
:=Jeff

Check page 12 of the 16F62X EEPROM Memory Programming Specification on Microchip's website. It's located with the docs for the 16X62X family, then go to the 16F628 page.
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This message was ported from CCS's old forum
Original Post ID: 1156

[Tomi]

Max. ROM size for 16C/F series PICs: 8192 words, so:
Addresses under programming (for ALL 16C/16F chips):
-------------------------------
0x0000 - 0x1FFF : the code ROM space
0x2000 - 0x20FF : Cofiguration Word and ID locations (only 8 out of 256 used)
0x2100 - : internal data EEPROM if exists

The data EEPROM is not a ROM, that is true. But you can instruct the compiler to write it into a HEX file as a ROM array started at a specific address. When your programmer reads the HEX file it will send out programming instructions to the specified addresses. Just keep in mind your EEPROM size limits, e.g. 0x2100 - 0x2140 for 16F84, 0x2100 - 0x217F for 16F62X, 0x2100 - 0x21FF for 16F877, etc.


:=I would like to place some data in the EEPROM of a PIC16F628 during programming. In the latest manual, the #ROM directive sounds like this is possible.
:=
:=The brief example in the manual shows the following for a '84:
:=#rom 0x2100={1,2,3,4,5,6,7,8}
:=
:=I've checked the '84 datasheet and don't understand how the 0x2100 address was derived (and what part of the EEPROM this actually is). I know when writing and reading to the data EEPROM, indirect addressing is used.
:=
:=First of all, is this possible?
:=Second, where would I find the information for the direct EEPROM addresses for the PIC16F62x?
:=
:=Thanks for any help,
:=Jeff
___________________________
This message was ported from CCS's old forum
Original Post ID: 1157