key.asm

spce061单片机的一些程序！C语言和汇编语言都有

.INCLUDE	hardware.inc

.PUBLIC	    Key_Scan;


.RAM
.PUBLIC		Key
.VAR    	Key
.VAR    	Key_Buff;           	//本次键值暂存单元
.VAR    	Key_Debounce;       	//计数单元
.VAR    	KeyScanLineBuff;


.DEFINE 	C_DebounceCnt	10;   	//去抖

.CODE   
Key_Scan:
		r1=0x0f00					//A8--A11置高，A12---A15不变       
		r1|=[P_IOA_Buffer]
		[P_IOA_Data]=r1	
         
        r1=[P_IOA_Data]
        r1&=0x00ff
        jnz F_SomeKeyIsPressed
        r1=0x0000
        [Key]=r1
        retf
//-----------------------------//
F_SomeKeyIsPressed:    
        call F_Key_Scaning
        r1=[Key_Buff]    			//读上次键值