key.asm

spce061单片机的一些程序！C语言和汇编语言都有

//================================================
//文件名称:key.asm
//功能描述:完成键扫描
//完成时间:2003-6-12
//================================================
.INCLUDE   hardware.inc
.DEFINE C_DebounceCnt	6;  

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

.CODE  
.PUBLIC  _KeyScan;
_KeyScan: .PROC
         r4=[P_IOA_Data]
         r4&=0x0007
         jnz F_SomeKeyIsPressed
         r1=0x0000
         [Key_Buff]=r1
         [Key_Strobe]=r1
         retf

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