test.asm

汇编语言与C51的相互调用简介,能给以一定的提示！

;add the "_" is because of this function get some pamerate in
;add the "_?" is because of this function is reentrantalbe
;add nothing before the function assert there is no pamerate


	EXTRN CODE(?C_STARTUP)


	;some one said this function is necessary,but i think this function assert is not necessary

;	EXTRN CODE(_?CTOA)	;the code is realize in the *.c file

	EXTRN CODE(_CTOA)


PUBLIC  _ATOC			;some othe *.c file will call this function

;byte        R7		R5	R3	R1
;DoubleByte  R7R6	R5R4	R3R2	R1R0

;R7R6	R7 is the low byte
;	R6 is the high byte

;	EXTRN DATA(DDDD)


	ORG 0020H

_ATOC:	MOV A,R7
	MOV B,R6

	MOV B,R5
	MOV A,R4
	
;	LCALL _?CTOA
	LCALL _CTOA

	MOV A,#40H
	MOV R7,#30H
	MOV R6,A
	RET


	END