How to get rid of SoftICE mode in P89V51RD2.
Disclaimer:
No warranty that this will work for your device.
No liability for damages, lost devices etc.
Do everything on your onwn risk.
Assuming bootloader v4 and softice mode (consequence of :00000002FE).
At this moment, the original state of bootloader is (hopefully) already restored.
Test:
- run your favorite terminal emulator, set 9600/8/n/1
NO_handshake. Switch CAPS LOCK ON (check led CapsLock on keyboard) and
hold U (for autorepeated capital U). Reset the target (or switch
off/on) while holding U. In a while, it should echo back the U's. Now
try typing
:020000050000f9
it should echo what you type and when typing
in the last character (="9") it should echo 2 more characters, a
fullstop and a carriage return, so the echo should look like:
:020000050000f9BF.
Now you can upgrade the bootloader to version 5 (can be found on Philips website) or try some other
bootloader modification...
REF: http://www.efton.sk/t0t1/unsoftice.htm
==============
REF 1:
==============
SFCF DATA 0B1H ; Flash Configuration
SFCM DATA 0B2H ; Flash Command
SFAL DATA 0B3H ; Flash Address Low
SFAH DATA 0B4H ; Flash Address High
SFDT DATA 0B5H ; Flash Data
SFST DATA 0B6H ; Flash Status
;************************************************************************
;* MCU IAP Commands *
;************************************************************************
SFCM_SE EQU 0BH ; Sector-Erase IAP cmd
SFCM_VB EQU 0CH ; Byte-Verify IAP cmd
SFCM_PB EQU 0EH ; Byte-Program IAP cmd
;************************************************************************
ORIG_DATA EQU R6
;************************************************************************
;* MAIN PROGRAM *
;************************************************************************
org 00000h
ljmp main
org 2000h
main: mov PSW, #0 ; select register bank 0
start: anl SFCF, #10111111b ; BFh--> force IAPEN=0
; orl SFCF, #10000000b ; VIS=1
; mov SFDT, #0 ; Enter any value other than 55h
mov dptr, #1f00h ;load destination addr.
lcall sector_erase ; erase the bytes before write to them
;=====================================================================
mov a,#00h
mov dptr,#1f20h
loop:
mov ORIG_DATA, a
lcall byte_pgm ; write a byte from ACC to dest address
lcall verify_byte ; read back the byte written to destination
xrl a, ORIG_DATA ; compare with original data
jnz ERROR ; jump to ERROR if verification fails
Stop:
ajmp Stop ; end of code execution
;************************************************************************
;* IAP SUBROUTINES *
;* 1. SECTOR-ERASE *
;* 2. BYTE-PROGRAM *
;* 3. BYTE-VERIFY *
;************************************************************************
;===================================================================
; Subroutine of Sector Erase
;===================================================================
sector_erase:
orl SFCF, #40h ; enable IAP
mov SFAH, dph ; load high order address byte
mov SFAL, dpl ; load low order address byte
mov SFCM, #SFCM_SE ; issue sector erase command
busy: mov a, SFST
jb acc.2, busy ; wait until flash is NOT busy.
safety:
anl SFCF, #10111111b ; disable IAP
mov SFDT, #0 ; any value other than 55h
ret
;=====================================================================
; Subroutine of Byte Program
;=====================================================================
byte_pgm:
orl SFCF, #40h ; enable IAP
mov SFAH, dph ; set address to write a byte
mov SFAL, dpl
mov SFDT, ORIG_DATA ; store data to be programmed
mov SFCM, #SFCM_PB ; issue program-byte cmd
done?: mov a, SFST
jb acc.2, done? ; wait until byte-programming is done.
ljmp safety
;=====================================================================
; Subroutine of Byte Verify
;=====================================================================
verify_byte:
orl SFCF, #40h ; enable IAP
mov SFAH, dph ; address from where to read a byte
mov SFAL, dpl
mov SFCM, #SFCM_VB ; issue verify_byte cmd
nop
mov a, SFDT ; data is stored in ACC
ljmp safety
;=====================================================================
ERROR:
mov p1, #55h ;indicating IAP failed.
EXIT:
sjmp $
END
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