Hi all,

I tested now also devices dated with 0017.
I programmed the following routines with and without setting the lock bits.
But all devices I can always reprogram after it.

1. routine:
rept 1024
mov p1, #0
endm
jmp 0

2. routine:
rept 1024
dec p1
endm
jmp 0

3. routine:
rept 1024
xrl p1, #0FFh
endm
jmp 0

Have anybody seen the ISP error, like described in the Atmel AT89S8252 errata sheet ?
Please, can you give me the code, which caused disabeling of further ISP.
Also please can you tell me, if it happens on more devices.

Its me inexplicable, why I can not force any of my devices in this error state.


Peter


P.S.
Please read the thread "Philiips Flash micro availability ?" also
for former discussion to this topic.