高精度数字电压表原理图及源程序

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1、vcct-15V八dfi.丄壬3D亠土士丄土亠X7A11X7AL2RSI隹NALESPOOADOP0.1.AD1P02.AD?PO3.AD3P04AD4P0SAD5P06AD5P07.AD7CJ23456^.P1P1P1P1P1P1P1P1P2a'A8P2.1/A9P22A10P23A11P2AA12P25A13P2.6A14P27.'A15P3ORXDP3I.TXOP3.2MT0乜：<1T1P3410P3M1P3ftWR巧3耶J2-OELE0068030405068^643^=f=tF=g=ilFrAD1674VEEl疋AOCS-12WAGNDSTS1CVWCB112ovr

2、01U4:A、vcc縫岁S588383&741SOO/5MfXLCD_CMD_WREQUOOEOHLCD_DATA_WREQUOOEIHLCD_BUSY_RDEQU00E2HLCD_DATA_RDEQU00E3HAD_12CMD_WRAD_8CMD_WRAD_8HB_RDAD_4LB_RDEQU00E0HEQU00E8HEQU00E4HEQUOOECH；初始化为12位转换器;初始化为8位转换器；W8Bit输出;低4Bit输出•匕•匕•匕

3、“•^T*♦{•♦[・*T*ORGOOOOHLJMPMAINORG0030HMAIN:MOVS匕#60HCLRRSOCLRRSIACALLINIT;LCD初始化；参数设置AD574:MOVDPTR,#AD_12CMD_WRMOVX@DPTR,A;启动转换SETBP3.0LOOP:NOPJBP3.0,LOOPMOVDPTR,#AD_8HB_RDMOVXA,@DPTRMOVR2,AMOVDPTR,#AD_4LB_RDMOVXA,@DPTRMOVR3,A;数据处理(参数)传递

4、;R2R3=(ABC0);处理后R2R3=(0ABC)MOVA,R2SWAPA；高低交换MOVR5,AANLA,#0F0H;MOVR4,AMOVA,R3SWAPAORLA,R4MOVR3,AMOVA,R5ANLA,#0FHMOVR2,A；入口参数：被减数在R2R3屮，减数在R6R7中；出口参数：差值在R2R3中MOVR6,#08HMOVR7,#00HCLRC;==========MOVA,R2SUBBA,R6JNCSUBI；无借位，直接运算SETB02HMOVA,R2CPLA;取反ANLA,#0FHMOVR2,AMOVA,R3CPLAMOVR3,ASUBI:CLRCMOVA,R

5、3SUBBA,R7MOVR3,AMOVA,R2SUBBA,R6MOVR2,A；乘以10计算MOVR1,#00HMOVA,R3LCALLMUL10MOV49H,AMOVA,R2LCALLMUL10MOV48H,A；除法运算；整数部分MOVR0,#30HLCALLDIVDOMOVA,40HMOV@R0,AINCROMOVA,#2EHMOV@R0,AINCRO；小数部分MOV45H,#05HALUDEF:MOVA,42HLCALLMUL10MOV47H,AMOVA,41HLCALLMUL10MOV46H,A;确定小数LCALLDIVD1MOVA,40HMOV@R0,AINCRODJN

6、Z45H,ALUDEFMOVA,#05HCLRCSUBBA,40HJCDV53SJMPDV54DV53:INC40HDECROMOVA,40HMOV@R0,ALOPJ:CJNE@R0,#0AH,DV54MOV@R0,#00HDECROINC@R0INCRO；========SJMPLOPJDV54:CLROVINCROMOV@R0,#56H;RET；显示MOVA,#01HACALLC51MOVA,#81HACALLC51MOVDPTR,#TAB1LCHIN:CLRAMOVCA,@A+DPTRINCDPTRLCALLC51DDRJNZLCHINMOVA,#0C3HACALLC51

7、JNB02H,LOP_MOVA,#2DHLCALLC51DDRLOP_:MOVR0,#30HMOVA,@ROLCALLCHASCIIINCROLCALLC51DDRMOVA,@ROINCROLCALLC51DDRMOVR1,#06HLOPXS:MOVA,@ROLCALLCHASCIILCALLC51DDRINCRODJNZR1,LOPXSMOVR2,#5DELLlms:LCALLDELDJNZR2,DELLlmsMOVA,#01HACALLC51MOVA,#0C3HACALLC51CLR02