fps16x162schar.s

来自「sdcc是为51等小型嵌入式cpu设计的c语言编译器支持数种不同类型的cpu」· S 代码 · 共 50 行

;
; fps16x162schar.S - convert fixed16x16 to signed char
;
; written by Vangelis Rokas, 2004 <vrokas AT otenet.gr>
;
;
; $Id: fps16x162schar.S 3838 2005-08-10 10:53:34Z tecodev $
;

	radix dec

;--------------------------------------------------------
; public variables in this module
;--------------------------------------------------------
	global ___fps16x162schar

;--------------------------------------------------------
;	Equates to used internal registers
;--------------------------------------------------------
STATUS	equ	0xfd8
WREG	equ	0xfe8
FSR0L	equ	0xfe9
FSR1L	equ	0xfe1
FSR2L	equ	0xfd9
POSTDEC1	equ	0xfe5
PREINC1	equ	0xfe4
PLUSW1	equ	0xfe3
PRODL	equ	0xff3
PRODH	equ	0xff4


S_fps16x162schar____fps16x162schar	code
___fps16x162schar:

	movlw	0x04
	movff	PLUSW1, PRODL

	movlw	0x03
	movf	PLUSW1, w

	btfss	PRODL, 7
	bra	@1
	negf	WREG

@1:
	return

	end