ST10f168 steak temporary unprotect

[michaeltscharntke9]

Posted on June 16, 2005 at 12:52

ST10f168 steak temporary unprotect

[michaeltscharntke9]

Posted on April 04, 2005 at 19:11

hello.

i have another problem: after activating protection setting the uprog bit i can not write to internal flash anymore. my writing function is located in external RAM and works without protection. To temporary unprotect i write a #0 to adress 0 like

MOVB RL4,#00h

MOV R5,#00h

MOV R10,#00h

EXTS R10,#01h

MOVB [R5],RL4

but after this my steak command returns with ''protection active'' error... (the code above shure is executed in internal flash!)

Which adresses do i have to set to zero to unprotect the flash temporary?

kindest regards,

itsme

[ This message was edited by: itsme on 04-04-2005 22:43 ]

[michaeltscharntke9]

Posted on April 05, 2005 at 08:05

1.

is it necessary to deprotect ST10F168 temporary to use the SFR ZEROS or is it enough to write a zero VALUE to an even address?

2.

Is a MOVB also ok or DO i need a WORD-Instruction MOV ?

3.

Is it possible to use indirect adressing or DO i need DIRECT ADRESSING?

I protect two mcu until now with missing right deprotection in internal flash. is there a way to deprotect (temporary) in another way or erase whole internal flash and protection bit or can i throw them to the ''waste-can''?!

[ Diese Nachricht wurde editiert von : itsme on 05-04-2005 12:34 ]

[michaeltscharntke9]

Posted on June 16, 2005 at 12:52

No, it seems that it MUST be the ZEROS register!

Anyway, nevertheless i have problems with unprotection. If i run a program in internfal flash like:

exts #3,#1

mov 08000h,ZEROS

[...]

copy some flash functions to memory

[...]

calls _erasepage (located in memory)

this works fine and the page is erased.

if i locate following procedure in internal flash and call it from external memory it does not work... curious...

example iflash:

org 038000H

exts #3,#1

mov 08000h,ZEROS

rets

external memory:

calls seg _038000, sof 38000h ; unprotect

..erasepage...

errorcode: flash protected...

?! How is this possible...

There are things between zero and one i do not understand... ;)