8051 Program - unsigned 8bit multiplication

; subroutine UMUL8

; 8-Bit x 8-Bit to 16-Bit Product Unsigned Multiply

;

; input: r0 = multiplicand X

; r1 = multiplier Y

;

; output: r1, r0 = product P = X x Y.

;

; alters: acc

UMUL8:	push b
	mov a, r0	;read X and ...
	mov b, r1	;... Y
	mul ab	;multiply X and Y
	mov r1, b	;save result high ...
	mov r0, a	;... and low
	pop b
	ret

Source: Maths Subroutines for the 8051 microcontroller, W.G.Marshall 2002

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Related topics:
8051 Program - signed 16bit addition   |   8051 Program - signed 32bit addition   |   8051 Program - signed 16bit subtraction   |   8051 Program - signed 32bit subtraction   |   8051 Program - signed 8bit multiplication   |   8051 Program - memory subroutines   |   8051 Program - math subroutines   |   8051 Program - conversion subroutines

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List of topics: 8051

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