8051 Program - sign fixup for divide

; Description:

; Does Sign Fixup For Divide

;

; Entry Requirements:

; Divisor In R4/5

; Dividend In R2/3

;

; On Exit:

; Divisor In R4/5, Sign Normalized

; Dividend In R2/3, Sign Normalized

;

; Affected:

; PSW.CY, PSW.Z, PSW.P, Acc, R2, R3, R4, R5

;

; Stack:

; 0 Bytes, Not Including Space Used By Called Routines

;

; Comments:

; Swiped From A Now Defunct 'C' Compiler

;

NEGEM:
	mov a,r2	;
	jnb acc.7,loop1	;
	clr a	;
	clr c	;
	subb a,r3	;
	mov r3,a	;
	clr a	;
	subb a,r2	;
	mov r2,a	;
		;
loop1:	mov a,r4	;
	jnb acc.7,loop2	;
	clr a	;
	clr c	;
	subb a,r5	;
	mov r5,a	;
	clr a	;
	subb a,r4	;
	mov r4,a	;
loop2:	ret	;

Source: Assorted Utilities, John C. Wren 11/23/96

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Related topics:
8051 Program - count ascii decimal in string   |   8051 Program - unsigned divide   |   8051 Program - unsigned mod   |   8051 Program - signed divide   |   8051 Program - signed mod   |   8051 Program - divide   |   8051 Program - memory subroutines   |   8051 Program - math subroutines   |   8051 Program - conversion subroutines

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List of topics: 8051

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