Use security register bits 15-31 as EEPROM

mmar · Post by **mmar** » Sat Nov 09, 2013 10:43 pm

I try found how to use bits 15-31 from program code but only in datasheet say user usage.

How many times may be reprogram this bits?

How code i need?

segher · Post by **segher** » Sun Nov 10, 2013 2:00 am

You can program it once only as far as I know.

mmar · Post by **mmar** » Sun Nov 10, 2013 12:03 pm

Xburn provides two writes when OTP enabled with XTAG for debug, then i mean multiple writes is possible from code in any time.

But how ?

Post by **Bianco** » Mon Nov 11, 2013 8:51 am

With OTP memory you can only write one state of a bit (blowing fuses).
Say the unwritten state is 1 and we can only write zeros then we have for example

Initial: 1111
Write1: 1110
Write2: 0110
Write3: 0000
~~write4: 1111~~

mmar · Post by **mmar** » Mon Nov 11, 2013 9:12 pm

Is security register part of OTP???

I mean NO.

segher · Post by **segher** » Mon Nov 11, 2013 10:55 pm

Yes, the security register is loaded from the OTP array.

Use security register bits 15-31 as EEPROM

Use security register bits 15-31 as EEPROM

Re: Use security register bits 15-31 as EEPROM

Re: Use security register bits 15-31 as EEPROM

Re: Use security register bits 15-31 as EEPROM

Re: Use security register bits 15-31 as EEPROM

Re: Use security register bits 15-31 as EEPROM