MC9S12XD256 flash 4000 and C000 protected

[MarkMa]

Hi all,

I am running a program with MC9S12XD256(80 pin), CW5.0, P&E Multilink tool. Some time when i power off the target board and power up again, using P&E Multilink to download and debug always indicates 'page 4000 is bad or protected',' page C000 is bad or protected'. Then I need to remove external oscillator(8MHz), using MCU internal  oscillator can be programming the flash.

That's  very appreciate, If you can have look at this. 

[kef]

Removing 8MHz crystal, you are switching to lower MHz self clock mode. Do you have any pull up resistor on BKGD? What value it is. I think that you may have too high R*C on BKGD. Shorting BKGD track length or lowering pull up resistance should help.