8051 Program – internal ram to external ram

; copy data from internal ram to external ram
	ORG 0H
	IRAM_ADDR EQU 40H
	ERAM_ADDR EQU 4000H
	BYTE_COUNT EQU 10
MAIN :
	MOV R0,#IRAM_ADDR
	MOV R7,#BYTE_COUNT
	MOV A, #0
memfill:	MOV @R0,A
	INC A
	INC R0
	DJNZ R7,memfill
	MOV R0,#IRAM_ADDR
	MOV DPTR, #ERAM_ADDR
	MOV R7,#BYTE_COUNT
	LCALL COPY
	SJMP MAIN
COPY:
	MOV A, #0
loop:	MOV A, @R0
	MOVX @DPTR, A
	INC R0
	INC DPTR
	DJNZ R7, loop
	RET
	END

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Related topics:
8051 Program - clear register banks   |   8051 Program - clear bit memory   |   8051 Program - clear stack memory   |   8051 Program - rom to ram   |   8051 Program - external ram to internal ram   |   8051 Program - ram to ram   |   8051 Program - memory subroutines   |   8051 Program - math subroutines   |   8051 Program - conversion subroutines

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List of topics: 8051

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