Flash erase byte routine

[EarlyBird2]

Reading the data sheet and your code example makes me think this statement is not true.

The FLASH as i have learned is not the same as EEProm in that you cant just change bytes values as you may like to on the fly , changing byte to $FF requires your do a complete sector erase , depending on the chip and the size the sector erase can range from 4k bytes to 64k bytes at a time.

and a write to any location is possible. But I will keep reading

[HenrikOlsson]

Hi,
Yes, they can be programmed one byte at the time at any arbitrary memory location. However, "programming" means changing (or not changing) a "1" to a "0". You can't change a "0" to a "1".
So, before you can program a location it needs to be erased ("reset" to $FF). Erasing is done either sector by sector or the entire chip (bulk).

/Henrik.

[EarlyBird2]

Hi,
Yes, they can be programmed one byte at the time at any arbitrary memory location. However, "programming" means changing (or not changing) a "1" to a "0". You can't change a "0" to a "1".
So, before you can program a location it needs to be erased ("reset" to $FF). Erasing is done either sector by sector or the entire chip (bulk).

/Henrik.

Yes I understand now. I was having difficulty finding the write command in the data sheet but as you explained the program command is used.