topic Re: writing in flash registers in 8-bit Microcontrollers

S08: writing in flash registers

ramabh — Tue, 13 Mar 2007 17:04:08 GMT

I am new to this HCS08.I am trying to wtrite data in flash registers FCDIV and FCMD but i am not able....what may be the possible reason for this one

Alban Edit: Added part number in subject line.

Message Edited by Alban on 2007-03-13 10:37 PM

Re: writing in flash registers

peg — Tue, 13 Mar 2007 17:33:29 GMT

Hi ramabh,

On the very limited information you have given I can suggest two possible issues:

1. FCDIV is "write once". That is only the first write to this register after a reset will be honoured.

2. FCMD is "write only" attempts to read it will always give 0.

Give us some more info on your problem and we may be able to help you more.

Re: writing in flash registers

ramabh — Tue, 13 Mar 2007 21:02:11 GMT

hi peg

Ya i know that FCMD is write only...i am just checking the memory location through debugger but i am not able to see the BYTE program command(0x20) there its showing 00 only and i am getting access error

whether we are not able to see the memory locations also

Re: writing in flash registers

peg — Wed, 14 Mar 2007 04:14:28 GMT

Hi,

"See"ing IS reading. Looking at this register in the debugger or simulator or whatever IS reading it! Reading this register either via programme code or via the BDM WILL yield ZERO! That is how it works and how it is documented in the datasheet.