If you are looking for an assembly code for Interfacing EEPROM with 8051 then you are at the right place. The Assembly code for EEPROM 24c16 is presented below.
This Sample code for EEPROM 24c16 can be used in electronics projects.
The following code can be used for 8051 and 8052 ICs like 89c51, 89c52, 89s51, 89s52, and 89c2051.
With a little bit of modification, this assembly program can be used for 24c02, 24c04, 24c08, 24c32
You can do EEPROM 24c16 interfacing with 8051 using the code given below.
Assembly code for Interfacing EEPROM with 8051
;==========================================================
;Pin Definitions
;==========================================================
eeprom_scl_pin equ a4h;scl p2.4
eeprom_sda_pin equ a5h;sda p2.5
;==========================================================
; Main Program starts from here
;==========================================================
mov memory_address1,#00h
mov memory_address2,#00h
mov eeprom_data,#05
call write_data
mov memory_address1,#00h
mov memory_address2,#00h
call read_data
mov 5dh,3ch
loop: jmp loop
;=========================================================
; Sub routines starts from here
;=========================================================
write_data: call eeprom_start
mov a,#a0h
call send_data
mov a,memory_address1 ;location address
call send_data
mov a,memory_address2 ;location address
call send_data
mov a,eeprom_data ;data to be send
call send_data
call eeprom_stop
ret
;=========================================================
read_data: call eeprom_start
mov a,#a0h
call send_data
mov a,memory_address1 ;location address
call send_data
mov a,memory_address2 ;location address
call send_data
call eeprom_start
mov a,#a1h
call send_data
call get_data
call eeprom_stop
ret
;=========================================================
eeprom_start: setb eeprom_sda_pin
nop
setb eeprom_scl_pin
nop
nop
clr eeprom_sda_pin
nop
clr eeprom_scl_pin
ret
;=========================================================
eeprom_stop: clr eeprom_sda_pin
nop
setb eeprom_scl_pin
nop
nop
setb eeprom_sda_pin
nop
clr eeprom_scl_pin
ret
;=========================================================
send_data: mov r7,#00h
send: rlc a
mov eeprom_sda_pin,c
call clock
inc r7
cjne r7,#08,send
setb eeprom_sda_pin
jb eeprom_sda_pin,$
; call eeprom_delay
call clock
ret
;=========================================================
get_data:
mov r7,#00h
setb eeprom_sda_pin
get: mov c,eeprom_sda_pin
call clock
rlc a
inc r7
cjne r7,#08,get
setb eeprom_sda_pin
call clock
mov 3ch,a
ret
;=========================================================
clock: setb eeprom_scl_pin
nop
nop
clr eeprom_scl_pin
ret
END
;=========================================================
eeprom_delay: mov 33h,#11 ;delay of 3 milliseconds
eeprom_delay_1: mov 32h,#ffh
djnz 32h,$
djnz 33h,eeprom_delay_1
ret
;=====================================================
; Program ENDS here
;=====================================================EEPROM ICs has application in various areas including data storage in embedded circuits, data manipulation, and data logger circuits.
