STC89LE53RC datasheet(127/165 Pages) STC

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9.3 IAP/EEPROM Assembly Language Program Introduction

; /*It is decided by the assembler/compiler used by users that whether the SFRs addresses are declared by the

DATA or the EQU directive*/

ISP_DATA

DATA

0E2H

ISP_DATA

EQU

0E2H

ISP_ADDRH

DATA

0E3H

ISP_ADDRH

EQU

0E3H

ISP_ADDRL

DATA

0E4H

ISP_ADDRL

EQU

0E4H

ISP_CMD

DATA

0E5H

ISP_CMD

EQU

0E5H

ISP_TRIG

DATA

0E6H

ISP_TRIG

EQU

0E6H

ISP_CONTR

DATA

0E7H

ISP_CONTR

EQU

0E7H

;/*Define ISP/IAP/EEPROM command and wait time*/

ISP_IAP_BYTE_READ

EQU

;Byte-Read

ISP_IAP_BYTE_PROGRAM

EQU

;Byte-Program

ISP_IAP_SECTOR_ERASE

EQU

;Sector-Erase

WAIT_TIME

EQU

;Set wait time

;/*Byte-Read*/

MOV

ISP_ADDRH,

#BYTE_ADDR_HIGH

;Set ISP/IAP/EEPROM address high

MOV

ISP_ADDRL,

#BYTE_ADDR_LOW

;Set ISP/IAP/EEPROM address low

MOV

ISP_CONTR,

#WAIT_TIME

;Set wait time

ORL

ISP_CONTR,

#10000000B

;Open ISP/IAP function

MOV

ISP_CMD,

#ISP_IAP_BYTE_READ

;Set ISP/IAP Byte-Read command

MOV

ISP_TRIG,

#46H

;Send trigger command1 (0x46)

MOV

IsP_TRIG,

#0B9H

;Send trigger command2 (0xb9)

NOP

;CPU will hold here until ISP/IAP/EEPROM operation complete

MOV

ISP_DATA

;Read ISP/IAP/EEPROM data

;/*Disable ISP/IAP/EEPROM function, make MCU in a safe state*/

MOV

ISP_CONTR,

#00000000B

;Close ISP/IAP/EEPROM function

MOV

ISP_CMD,

#00000000B

;Clear ISP/IAP/EEPROM command

;MOV

ISP_TRIG,

#00000000B

;Clear trigger register to prevent mistrigger

;MOV

ISP_ADDRH,

;Set address high(00h), Data ptr point to non-EEPROM area

;MOV

ISP_ADDRL,

;Clear IAP address to prevent misuse

SETB

;Set global enable bit

;/*Byte-Program, if the byte is null(0FFH), it can be programmed; else, MCU must operate Sector-Erase firstly,

and then can operate Byte-Program.*/

MOV

ISP_DATA,

#ONE_DATA

;Write ISP/IAP/EEPROM data

MOV

ISP_ADDRH,

#BYTE_ADDR_HIGH

;Set ISP/IAP/EEPROM address high

MOV

ISP_ADDRL,

#BYTE_ADDR_LOW

;Set ISP/IAP/EEPROM address low

MOV

ISP_CONTR,

#WAIT_TIME

;Set wait time

ORL

ISP_CONTR,

#10000000B

;Open ISP/IAP function

MOV

ISP_CMD,

#ISP_IAP_BYTE_READ

;Set ISP/IAP Byte-Read command

MOV

ISP_TRIG,

#46H

;Send trigger command1 (0x46)

MOV

ISP_TRIG,

#0B9H

;Send trigger command2 (0xb9)

NOP

;CPU will hold here until ISP/IAP/EEPROM operation complete

127

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