AT89C51AC3_05 Datasheet, PDF (36/143 Pages) ATMEL Corporation – Enhanced 8-bit Microcontroller with 64KB Flash Memory

Examples
;*F*************************************************************************;* NAME: api_rd_eeprom_byte
;* DPTR contain address to read.
;* Acc contain the reading value
;* NOTE: before execute this function, be sure the EEPROM is not BUSY
;***************************************************************************
api_rd_eeprom_byte:
MOV EECON, #02h; map EEPROM in XRAM space
MOVX A, @DPTR
MOV EECON, #00h; unmap EEPROM
ret
;*F*************************************************************************
;* NAME: api_ld_eeprom_cl
;* DPTR contain address to load
;* Acc contain value to load
;* NOTE: in this example we load only 1 byte, but it is possible upto
;* 128 Bytes.
;* before execute this function, be sure the EEPROM is not BUSY
;***************************************************************************
api_ld_eeprom_cl:
MOV EECON, #02h ; map EEPROM in XRAM space
MOVX @DPTR, A
MOVEECON, #00h; unmap EEPROM
ret
;*F*************************************************************************
;* NAME: api_wr_eeprom
;* NOTE: before execute this function, be sure the EEPROM is not BUSY
;***************************************************************************
api_wr_eeprom:
MOV EECON, #050h
MOV EECON, #0A0h
ret
36 AT89C51AC3
4383B–8051–01/05