AN2720 erase and flash problem in mc9s12dp256b

[big6]

Hi,

I tried to create a bootloader for mc9s12dp512 or mc9s12dp256b.

I downloaded AN2720 package and did a test.

I used the all code from AN2720 and I did not change anything!

AN2720 could erase and flash Page 3F, 3E, 3D, 3C (block 0), when the flash routines are located in page 3D. It is very good!

However, it is strange that AN2720 functions COULD NOT erase and flash the pages such as 3B, 3A, 39, 38, 37, 36, 35, 34, 33, 32, 31, 30.

Can anyone help me to solve this problem?

Thanks

[kef]

If code in AN2720SW.zip is the same like it is in AN2720.pdf, then it is made for single bank chips like S12D64. S12DP256 has 4 * 64k banks and you need to set up flash bank select bits before each erase or program operation. By default bank 0 is selected and so this code is fine programming pages 3C-3F.

[big6]

Got it.

Thank you very much