irq.asm

暑假做的直流电源的程序,能实现分级调控输出,并在数码管显示

.include hardware.inc
.external _F_Key_Scan;
.external _LED_Display;
//////////////////////////////
//做为键盘扫描用
//////////////////////////////
.text
.public _IRQ6
_IRQ6:        
		push r1,r4 to [sp];
		r1=0x0001;
		test r1,[P_INT_Ctrl];
		jnz  _IRQ6_TMB2;
		r1=0x0002;
		[P_INT_Clear]=r1;
		pop r1,r4 from [sp];
        reti;         
_IRQ6_TMB2:
		[P_INT_Clear]=r1;
		r2=[P_IOA_Data] 
		r3=[P_IOB_Data]             //使AD7524处于保持状态
	    r3 = r3&0xbfff;	
	    [P_IOB_Data]=r3 
		call	_F_Key_Scan;        //扫描键盘
		//call _LED_Display;              //LED显示
		[P_IOA_Data] = r2  
		pop r1,r4 from [sp];
        reti;