8051 Program – subtraction 8bit

; 8-bit subtraction
; R7-R6
	ORG 0H
	ERAM EQU 4000H
MAIN:
	MOV R7,#20	; load data1 in to R7
	MOV R6,#15	; load data2 in to R6
	LCALL SUB_8
	SJMP MAIN
SUB_8:
	CLR C	; clear carry flag
	MOV A,R7	; load data1 in to accumulator
	SUBB A,R6	; subtract data2 from data1
store:
	MOV DPTR,#ERAM	; point to external RAM
	MOVX @DPTR,A	; store the result
	RET
	END

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Related topics:
8051 Program - arithmetic operation 8bit   |   8051 Program - addition 8bit   |   8051 Program - multiplication 8bit   |   8051 Program - division 8bit   |   8051 Program - addition 16bit   |   8051 Program - subtraction 16bit   |   8051 Program - multiplication 16bit   |   8051 Program - division 16bit   |   8051 Program - addition multibyte   |   8051 Program - multiplication 16bit by 8bit   |   8051 Program - addition 8bit 2digit bcd   |   8051 Program - memory subroutines   |   8051 Program - math subroutines   |   8051 Program - conversion subroutines

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List of topics: 8051

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