EEPROM codes.

Gabe

SDA PIN 8
DevType CON %1010 << 4 ' device type
DevAddr CON %000 << 1 ' address = %000 -> %111

Rd2432 CON DevType | DevAddr | 1 ' read from 24LC32
T_addr VAR Word
ReadKey VAR Byte


 
FOR T_addr.BYTE1 = $0 TO $7F
FOR T_addr.BYTE0 = $0 TO $FF
I2CIN SDA, Rd2432, T_addr.BYTE1\T_addr.BYTE0, [noparse][[/noparse]ReadKey]
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Hi Guys,.

Could you guys enlighten me on how should i change the values in these codes that were originally used for a 256kb external EEPROM?·I'm currently using a 512kb EEPROM. The purpose of this is to read in data from the EEPROM... some sort of initialising the EEPROM for a particular program. It is supposed to feedback to me whether the EEPROM is full, empty, and if there is data in it, there would be a count on how many memory locations are taken up.

Another seperate question, I would like to know, in a typical EEPROM chip, is there a value of $7C stored in the very last memory location?

Thanks in advance for any help,
Gab

Forrest

A 24LC512 I2C EEROM contains 64KBytes of memory - or $FFFF. This means both the high and low address bytes (bytes 0 and 1) will be $FF for the last memory address.This is explained the the datasheet for the 24LC512 which you can download here ww1.microchip.com/downloads/en/DeviceDoc/21754E.pdf

Gabe

Thanks alot for the information, Forrest.

Regards,
Gab