key.asm

spce061单片机的一些程序！C语言和汇编语言都有

.INCLUDE   	hardware.inc

.DEFINE 	C_DebounceCnt	50;  

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

.CODE  
.PUBLIC  	_KeyScan;
_KeyScan: .PROC
         r2=[P_IOA_Data]
         r2&=0xff00
         jnz F_SomeKeyIsPressed
         r1=0x0000
         [Key_Buff]=r1
         retf

 F_SomeKeyIsPressed:    
         r1=[Key_Buff]    		//读上次键值