[牛人杂谈] N76E003之ISP

;******************************************************************************

; This code illustrates how to do APROM and CONFIG IAP from LDROM.

; APROM are re-programmed by the code to output P1 as 55h and P0 as aah.

; The CONFIG2 is also updated to disable BOD reset.

; User needs to configure CONFIG0 = 0x7F, CONFIG1 = 0xFE, CONFIG2 = 0xFF.

;******************************************************************************

PAGE_ERASE_AP EQU 00100010b

BYTE_PROGRAM_AP EQU 00100001b

BYTE_READ_AP EQU 00000000b

ALL_ERASE_CONFIG EQU 11100010b

BYTE_PROGRAM_CONFIG EQU 11100001b

BYTE_READ_CONFIG EQU 11000000b

ORG 0000h

CLR EA ;disable all interrupts

CALL Enable_IAP

CALL Enable_AP_Update

CALL Erase_AP ;erase AP data

CALL Program_AP ;programming AP data

CALL Disable_AP_Update

CALL Program_AP_Verify ;verify Programmed AP data



CALL Read_CONFIG ;read back CONFIG2

CALL Enable_CONFIG_Update

CALL Erase_CONFIG ;erase CONFIG bytes

CALL Program_CONFIG ;programming CONFIG2 with new data

CALL Disable_CONFIG_Update

CALL Program_CONFIG_Verify ;verify Programmed CONFIG2

CALL Disable_IAP



MOV TA,#0Aah ;TA protection

MOV TA,#55h ;

ANL CHPCON,#11111101b ;BS = 0, reset to APROM

MOV TA,#0Aah

MOV TA,#55h

ORL CHPCON,#80h ;software reset and reboot from APROM

SJMP $

;********************************************************************

; IAP Subroutine

;********************************************************************

Enable_IAP:

MOV TA,#0Aah ;CHPCON is TA protected

MOV TA,#55h

ORL CHPCON,#00000001b ;IAPEN = 1, enable IAP mode

RET

Disable_IAP:

MOV TA,#0Aah

MOV TA,#55h

ANL CHPCON,#11111110b ;IAPEN = 0, disable IAP mode

RET

Enable_AP_Update:

MOV TA,#0Aah ;IAPUEN is TA protected

MOV TA,#55h

ORL IAPUEN,#00000001b ;APUEN = 1, enable APROM update



RET

Disable_AP_Update:

MOV TA,#0Aah

MOV TA,#55h

ANL IAPUEN,#11111110b ;APUEN = 0, disable APROM update

RET

Enable_CONFIG_Update:

MOV TA,#0Aah

MOV TA,#55h

ORL IAPUEN,#00000100b ;CFUEN = 1, enable CONFIG update

RET

Disable_CONFIG_Update:

MOV TA,#0Aah

MOV TA,#55h

ANL IAPUEN,#11111011b ;CFUEN = 0, disable CONFIG update

RET

Trigger_IAP:

MOV TA,#0Aah ;IAPTRG is TA protected

MOV TA,#55h

ORL IAPTRG,#00000001b ;write ‘1’ to IAPGO to trigger IAP process

RET



;********************************************************************

; IAP APROM Function

;********************************************************************

Erase_AP:

MOV IAPCN,#PAGE_ERASE_AP



MOV IAPFD,#0FFh

MOV R0,#00h

Erase_AP_Loop:

MOV IAPAH,R0

MOV IAPAL,#00h

CALL Trigger_IAP

MOV IAPAL,#80h

CALL Trigger_IAP

INC R0

CJNE R0,#44h,Erase_AP_Loop

RET

Program_AP:

MOV IAPCN,#BYTE_PROGRAM_AP

MOV IAPAH,#00h

MOV IAPAL,#00h

MOV DPTR,#AP_code

Program_AP_Loop:

CLR A

MOVC A,@A+DPTR

MOV IAPFD,A

CALL Trigger_IAP

INC DPTR

INC IAPAL

MOV A,IAPAL

CJNE A,#14,Program_AP_Loop

RET

Program_AP_Verify:

MOV IAPCN,#BYTE_READ_AP



MOV IAPAH,#00h

MOV IAPAL,#00h

MOV DPTR,#AP_code

Program_AP_Verify_Loop:

CALL Trigger_IAP

CLR A

MOVC A,@A+DPTR

MOV B,A

MOV A,IAPFD

CJNE A,B,Program_AP_Verify_Error

INC DPTR

INC IAPAL

MOV A,IAPAL

CJNE A,#14,Program_AP_Verify_Loop

RET

Program_AP_Verify_Error:

CALL Disable_IAP

MOV P0,#00h

SJMP $

;********************************************************************

; IAP CONFIG Function

;********************************************************************

Erase_CONFIG:

MOV IAPCN,#ALL_ERASE_CONFIG

MOV IAPAH,#00h

MOV IAPAL,#00h

MOV IAPFD,#0FFh



CALL Trigger_IAP

RET

Read_CONFIG:

MOV IAPCN,#BYTE_READ_CONFIG

MOV IAPAH,#00h

MOV IAPAL,#02h

CALL Trigger_IAP

MOV R7,IAPFD

RET

Program_CONFIG:

MOV IAPCN,#BYTE_PROGRAM_CONFIG

MOV IAPAH,#00h

MOV IAPAL,#02h

MOV A,R7

ANL A,#11111011b

MOV IAPFD,A ;disable BOD reset

MOV R6,A ;temp data

CALL Trigger_IAP

RET

Program_CONFIG_Verify:

MOV IAPCN,#BYTE_READ_CONFIG

MOV IAPAH,#00h

MOV IAPAL,#02h

CALL Trigger_IAP

MOV B,R6

MOV A,IAPFD

CJNE A,B,Program_CONFIG_Verify_Error

RET



Program_CONFIG_Verify_Error:

CALL Disable_IAP

MOV P0,#00h

SJMP $

;********************************************************************

; APROM code

;********************************************************************

AP_code:

DB 75h,0B1h, 00h ;OPCODEs of “MOV P0M1,#0”

DB 75h,0B3h, 00h ;OPCODEs of “MOV P1M1,#0”

DB 75h, 90h, 55h ;OPCODEs of “MOV P1,#55h”

DB 75h,080h,0Aah ;OPCODEs of “MOV P0,#0Aah”

DB 80h,0Feh ;OPCODEs of “SJMP $”

END