Yes, I've made an hardware reset.

You're right by saying that the hardware should be tested with assembler.

I was thinking that a so simple software shouldn't be a problem.
I was working on 68HC11 before and I've done this simple test to check if the software can boot so often that I lost the use of the quick testing in assembler...

However, I can't see where is the problem there....

Here under is the assembler generated code from Keil :

0000 E4 CLR A
0001 F58E MOV AUXR,A
0003 ?C0001:
0003 E4 CLR A
0004 F590 MOV P1,A
0006 7590FF MOV P1,#0FFH
0009 80F8 SJMP ?C0001
000B 22 RET

Any idea ?

Stephane