Time to Write to Internal Eeprom & Flash?

KenMacfarlane · Posted: Mon Nov 21, 2005 5:11 am

I want to buffer 20-30 bytes of data arriving every few seconds, to any spare internal eeprom or flash program memory that I've got left Idea

, on a 10 MHz Modtronics SB65 (PIC18f6621), in case I loose the serial link to a PC host for a few minutes.

Anybody know how long it takes to read or write using these funcs? Question

write_eeprom & read_eeprom
write_program_eeprom & read_program_eeprom
write_program_memory & read_program_memory

Neither the CCS help or manual give any idea, but I presume that there is a "write every few hundred microseconds" until it reads back correct going on inside the write routines, and that this might take a few millisecs per byte????

asmallri · Joined: 12 Aug 2004 Posts: 1634 Location: Perth, Australia

The CCcode overhead is negligible. The time is dependant on the write characteristics of the device and can be found in the data sheet for the processor. For example, a 18F1320 has an 18ms page write to Flash Program Memory time. The CCS executes the write and waits until it is complete before returning.
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