Erase at 5V!!

[houshen67782]

Posted on August 10, 2005 at 06:30

Erase at 5V!!

[houshen67782]

Posted on July 25, 2005 at 14:11

hello everybody.

If we use 5V to erase the ST7, is it meanings something? As we know, if we want to erase the ST7, we should use 12V on the pin Vpp. Are there somebody can tell me what happens if we use 5V in Vpp to erase ST7? Thanks your attentions! Best regards! ;)

[sjo]

Posted on July 25, 2005 at 17:36

in simple terms - it won't erase.

Vpp for erase/program is usually between 11.4-12.6v for HDFlash devices. Regards sjo

[houshen67782]

Posted on July 28, 2005 at 14:05

Thank you very much for you reply.sjo

Can you flash memory in ''programming_block''? I have problem always! I thank my program is correct. But sometimes i can not flash correctly with ''programming_block''.But i can do it correctly with ''programming_byte'' best regards ;)

[sjo]

Posted on July 28, 2005 at 14:07

I implement the block programming in Flashbash and have had no problems.

Generally the HDFlash used is not the best ever Flash I have come across. Regards sjo

[houshen67782]

Posted on August 01, 2005 at 06:05

Thanks for your reply.

But now, i have to use ''Block programming'' to rewrite the program in flash memory. I flash 16 byte in one ''block''. How many bytes are there in your ''block''? best regards.

[sjo]

Posted on August 01, 2005 at 06:40

I program 256 bytes in a block, for this SECT must be 0.

Regards sjo

[houshen67782]

Posted on August 02, 2005 at 08:07

I program 16 bytes in a block, but i find something strange.

For example, at frist, i program the frist block with 16bytes, and i can flash correctly. Then i program the seconde block, and i find some codes in the flash memory which i have flashed at frist time is changed!! It is really strange!! regards NewBee3

[alok2]

Posted on August 08, 2005 at 07:30

Hi NewBee3

''If we use 5V to erase the ST7, is it meanings something? '' Pls use charge pump ST662 for generating 12V from 5V. Probably this is what you were trying to find.

[houshen67782]

Posted on August 10, 2005 at 06:03

Hi alok

Thank your messages.But what is ST662?And i have used 12V to erase the flash memory,and rewrite the codes with IAP.If i use the mode ''programming block'', i can not flash correctly.