EEPROM - Write 4 digit decimal number

danlo

i want to write 4 digit decimal number into EEPRom, but the value of each eeprom cell can only store 0 - 255 value.
How to store 4 digit decimal number e.g 2005 into EEProm?... Would you give me some suggestions?

Bruce Bates

danlo -

EEPROM's are generally byte oriented devices. Thus, to write anything, number or otherwise, if it takes more than one byte to contain it, you need to write the appropriate number of bytes one-at-a-time. A 4 digit number can be contained in a WORD (2 bytes) variable. Therefore you need to write two byter as shown below:

number VAR WORD

number = 2005

WRITE 0, number.highbyte···· 'Check exact syntax in the PBASIC manual
WRITE 1, number.lowbyte

Regards,

Bruce Bates

Post Edited (Bruce Bates) : 2/26/2007 12:15:47 PM GMT

Zoot

You can also write the entire word in one command. Note however, that writing a Word writes the LOWBYTE *first*, so when writing individual bytes you might want to write lower bytes first for consistency:

number VAR WORD
number = 2005
WRITE 0, Word number    'now number.LOWBYTE is at address 0, number.HIGHBYTE is at address 1

' above is same as doing this:
WRITE 0, number.LOWBYTE   
WRITE 1, number.HIGHBYTE

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