.DEFINE		P_INT_Ctrl		    0x7010 
.DEFINE		P_INT_CLEAR			0x7011 
.DEFINE		P_ADC_Ctrl		    0x7015 
.DEFINE		P_ADC_MUX_Ctrl		0x702b 
.DEFINE		P_ADC_MUX_DATA		0x702C
.DEFINE		P_DAC_Ctrl		    0x702A 
.DEFINE     P_WATCHDOG_CLEAR    0x7012
.CODE
.PUBLIC _F_VolAD
_F_VolAD:  

    R1 = 0x0001                  //選擇通道LINE_IN為IOA0
	[P_ADC_MUX_Ctrl] = R1
    R1 = 0x0001	                 //允許A/D轉(zhuǎn)換
    [P_ADC_Ctrl] = R1 		 
    
L_AD: 	 
    R1 = [P_ADC_MUX_Ctrl]        //讀寄存器[P_ADC_MUX_Ctrl]的B15位
    TEST R1,0x8000               //判斷是否轉(zhuǎn)換完畢
    JZ L_AD                      //否，繼續(xù)轉(zhuǎn)換
    R1 = [P_ADC_MUX_DATA]          //是，則讀出[P_ADC_MUX_DATA]轉(zhuǎn)換結(jié)果
    [P_IOB_DATA] = R1              //同時觸發(fā)A/D重新轉(zhuǎn)換
    R1 = 0x0001
    [P_WATCHDOG_CLEAR] = R1      //清看門狗
    JMP L_AD;