data flash problem in R8C13

i am experiencing a problem with R8C13 controller data flash , sometimes the data stored in the memory is being erased at the time of power on. i hope it had not been erased since i am getting "00" instead of "FF".

Could any one help me regarding this.

Hi sailaja,

Could you provide some more info? Flash memory will always erase to xFF, not x00. Can you perhaps post some code or give us some insight as to when you are seeing this in your bootup and how you are verifying the issue?

Thx,

-r

Have you verified that you have set the PM10 bit which enables the data flash?  If you have not enabled it you may not read the correct data

Previously sailaja wrote:

i am experiencing a problem with R8C13 controller data flash , sometimes the data stored in the memory is being erased at the time of power on. i hope it had not been erased since i am getting "00" instead of "FF".

Could any one help me regarding this.

Hi everyone.

I'm using R8C25 and I experienced the same problem when I tried to emulate flash area like an EEPROM.

I'm using E8 emulator. When I call the "block_erase" function, in the HEW memory window, I noticed that some bytes of block is erased to 0x00 value instead of 0xFF.

I am using the function given in the Renesas Application Notes about R8C Series page:

http://eu.renesas.com/sensitivity.do?downloadId=D1008770

Is there a hardware bug in R8C series?