8051 Program - signed 16bit multiply Accumulate

; subroutine MAC16

; 16-Bit x 16-Bit to 32-Bit Product signed Multiply-Accumulate

; 2's Complement format

;

; input: r1, r0 = multiplicand X

; r3, r2 = multiplier Y

; r7, r6, r5, r4 = 32-bit accumulator Ar

;

; output: r7, r6, r5, r4 = accumulated result Ar = Ar + (X x Y)

; r3, r2, r1, r0 = multiply result M = X x Y

; Carry C set if overflow

;

; calls: MUL16

;

; alters: acc, C, Bits 21H & 22H

MAC16:	anl PSW, #0E7H	;Register Bank 0
	acall MUL16+3
	mov A, r4
	add A, r0
	mov r4, A
	mov A, r5
	addc A, r1
	mov r5, A
	mov A, r6
	addc A, r2
	mov r6, A
	mov A, r7
	addc A, r3
	mov r7, A
	mov C, OV
	ret

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

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Related topics:
8051 Program - signed 8bit multiplication   |   8051 Program - unsigned 8bit multiplication   |   8051 Program - signed 8bit x 16bit multiplication   |   8051 Program - signed 16bit multiplication   |   8051 Program - unsigned 16bit 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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