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Ext EEPROM read delay?

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brodin

New Member
Question 1:
I have used external eeproms sinse i started using PIC:s about a year ago. I have always thought that there should be a 10ms delay between each read/write to the eeprom.

But now when i am thinking of it, is it really nessecary when reading? I can remember i have seen a explanation to the delay that says that there must be a delay for the data to be written to EEPROM.

The read delay is a problem when i am displaying a bitmap on my GLCD when reading from EEPROM. The drawing procedure takes toooooooo long time because of the read delay.


I have also thought of put the bitmap data in the PIC:s program memmory. Is that difficult? I am using PicBasic Plus. I suppose reading from program memmory would be ways faster than from a EEPROM, right?
 

Nigel Goodwin

Super Moderator
Most Helpful Member
As you say, there is a delay time when you WRITE to EEPROM, not when you read!. You can also usually write more than one byte, the actual number depending on the particular EEPROM, followed by a single delay time - this speeds writing considerably. Consult the datasheet for your EEPROM for more details (generally the larger the EEPROM, the more bytes you can write).
 
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