isr.asm

来自「内含丰富的单片机源代码」· 汇编 代码 · 共 36 行

.include 	hardware.inc
.external 	_g_uisum;
.external 	_g_ucIntFlag;
.TEXT
.PUBLIC _IRQ5
_IRQ5:                        //定时3秒的中断程序
	push r1,r4 to [sp];
	r1 =0x0008;						 
	test r1,[P_INT_Ctrl];				
	jnz	L_4Hz;				    	
	
	r1 = 0x0004;
    [P_INT_Clear] = r1;        //清中断
    
    r1 = [_g_uisum]            //取时基信号量     
    r1 += 1;
    cmp r1,4;
    jnb loop0;
    
    [_g_uisum]=r1              //保存时基信号量
    pop r1,r4 from [sp];
    reti; 

loop0: 
    r1 = 0x0001;
    [_g_ucIntFlag] = r1;       //设置中断标识
    r1 = 0
    [_g_uisum] = r1

	pop r1,r4 from [sp];
    reti;
L_4Hz:  
 	r1 = 0x0008;
    [P_INT_Clear] = r1;  		//清中断
    pop r1,r4 from [sp];
    reti;