system.asm

来自「随着数字语音、图像处理技术的飞速发展」· 汇编 代码 · 共 32 行

.include hardware.inc;

.CODE
.public _System_Initial;
.public	F_System_Initial;
_System_Initial: .PROC
F_System_Initial:

	R1 = 0							
	[R_InterruptStatus] = R1		//中断状态标志
	[P_INT_Ctrl] = R1				//清所有中断
        
        
    R1 = 0xFFFC             //IOA0--IOA1 接键盘，设置为输入
    [P_IOA_Dir] = R1        //IOA5--IOA7 接SRAM控制线，设置为输出
    [P_IOA_Attrib] = R1     //
    R1 = 0xFFFC 
    [P_IOA_Data] = R1    
         
    R1=0xFFFF
	[P_IOB_Attrib] = R1		//Set port B to output
	[P_IOB_Dir] = R1			//Set port B to output
	R1 = 0x0000
	[P_IOB_Data] = R1
	
	retf;
	.ENDP;