8051 Program - signed 16bit multiplication

; subroutine MUL16

; 16-Bit x 16-Bit to 32-Bit Product Signed Multiply

; 2's Complement format

;

; input: r1, r0 = multiplicand X

; r3, r2 = multiplier Y

;

; output: r3, r2, r1, r0 = product P = X x Y

;

; calls: UMUL16, Cr0r1, Cr2r3, Mr0r3

;

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

MUL16:	anl PSW, #0E7H	;Register Bank 0
	acall Cr0r1	;2's comp -> Mag/Sign
	acall Cr2r3	;2's comp -> Mag/Sign
	acall UMUL16
	acall Mr0r3	;Mag/Sign -> 2's Comp
	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 - unsigned 16bit multiplication   |   8051 Program - signed 16bit multiply Accumulate   |   8051 Program - memory subroutines   |   8051 Program - math subroutines   |   8051 Program - conversion subroutines

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List of topics: 8051

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