utilities.a51

来自「TI 集成高性能24位A/D转换器的8052 核心单片机MSC1210 A/D转」· A51 代码 · 共 36 行

;
; Copyright 2002 Texas Instruments
;
$include (reg1210.inc)
PUBLIC	unipolar, bipolar

adc_sub 	SEGMENT  CODE
	RSEG  adc_sub

;;;;;;;;;;;;;;;;;;;;;
; unsigned long unipolar(void)
; return the 3 byte adres to R4567 (MSB~LSB)
; unsigned long int with R4=0
unipolar:
	mov	r4,#0
	mov	r5,adresh
	mov	r6,adresm
	mov	r7,adresl
	ret

;;;;;;;;;;;;;;;;;;;;;
; signed long bipolar(void)
; return the 3 byte adres to R4567 (MSB~LSB)
; return signed long int with sign extendsion on R4
bipolar:
	mov	r4,#0
	mov	a,adresh
	mov	r5,a
	mov	r6,adresm
	mov	r7,adresl
	jnb	acc.7,positive
	mov	r4,#0ffh
positive:
	ret
	end