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Memory question and 18f4525

 
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Joseph88



Joined: 14 Aug 2006
Posts: 17

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Memory question and 18f4525
PostPosted: Fri Dec 22, 2006 8:13 am     Reply with quote
I am working on a keyboard/lcd project where the user types a label into a small LCD and hopefully store the information somewhere on the pic.

Which is better to use, program memory or the EEPROM? I'm using 24 LCD's that can accept up to a maximum of 8 characters (24x8bytes=192bytes). The 18f4525 has plenty of eeprom and program memory, but i'm wondering would one be more efficent than the other?

Thanks in advance.
Joe
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Fri Dec 22, 2006 1:33 pm     Reply with quote
Download the 18F4525 data sheet:
http://ww1.microchip.com/downloads/en/DeviceDoc/39626b.pdf
Look near the end of the data sheet, at this section:
TABLE 26-1: MEMORY PROGRAMMING REQUIREMENTS

Here are the endurance specs:
Code:

Data EEPROM Memory:     
                    Min      Typ
 Byte Endurance     100K     1M


Program Flash Memory:
                    Min      Typ
 Cell Endurance     10K      100K


Go to the Ramtron site and download the data sheet for the FM24C64.
http://www.ramtron.com/doc/Products/Nonvolatile/Nonvolatile_list.asp?ID=5
Endurance specs:
High Endurance -- 1 Trillion (10^12) Read/Writes
45 Year Data Retention
NoDelay™ Writes
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