RE: mpc555 internal flash programming

Actually, all you have to do is set the FLEN in the IMMR (SPR 638) to
enable the access to the flash from the debugger. This is easier than
setting the the external hardware config word. But if you want to force
the external reset config word, pull RSTCFG low and put a pull up on
D20. the internal pull downs on the data bus will take care of the other
bits of the reset config word. Note the internal pull downs may not pull
low fast enough in all situations (short application of reset over
temperature), but will work for development.
 
be sure to program HC bit in the flash reset config word to a zero (0b0)
to enable the flash in normal boot mode.

________________________________

From: [email protected] [mailto:[email protected]] On Behalf
Of Prathamesh
Sent: Monday, September 24, 2007 11:13 AM
To: [email protected]
Subject: [MPC500] mpc555 internal flash programming



Hi,
I am working with mpc555 with Greenhills C compiler. On my board i 
have pulled /RSTCONF to high, i.e hard reset configuration word is 
being read as default 0x00000000. 
I need to write into internal flash of mpc555. For that bit 20 of hard 
reset configuration word should be 1 ie. FLEN should be set.

How can i achieve this with this configuration?

Or the only option in this case is making /RSTCONF as low and read the 
hard reset configuration word from the data lines. Here i will need to 
pull down all the data lines except D20 which i will need to pull up.

.
 
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