Problems with SPI0 pin reassignment at MC9S08PA32

[fernandolima]

Hello everybody.

I'm having problems with SPI0 pin reassignment at MC9S08PA32.

I am unable to change SYS_SOPT1 register. Why I can't change this register?

My assembly code is:

LDA SYS_SOPT1

ORA #mSYS_SOPT1_SPI0PS

STA SYS_SOPT1 ;Directs the SPI0 port for PORTE

Afer I write this register, the value of this register doesn't change.

Does anybody know what is the problem? Is there a password to change this register like there is for to change the watchdogs registers?

[david_diaz]

Hello Fernando,

Please be aware that the SYS_SOPT1 is a write-once register.

Make sure you don’t write this register before the lines mentioned.

If the problem is still there, please let me know, I am glad to help.

Have a great day. :smileyhappy:

David.