ic键盘显示c程序（ ic keyboard display c program）

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1、7290i2c键盘显示c51程序（7290I2CkeyboarddisplayC51program）7290I2CkeyboarddisplayC51program[2005-8-1710:18:53Kassey]By:

2、/*****************************************File:iic.hDescription:issuitablefor24MHzcrystaloscillator,referringtowww.zlgmcu.comprogramAuthor:kassey@126.comDate:July,7

3、th,2005*****************************************/Include/**/*containsheaderfilesInclude#define(_Nop)_nop_()/*definitionofaninstruction./*often,variabledefinitionregion*/Adefinitionofport/**/SbitSDA=P1^0;/*I2C*/bitdatatransfersimulationSbitSCL=P1^1;/**/I2C

4、analogclockcontrolSign/**/Bitack;/**/responseflag/*******************************************************************StartingbusfunctionPrototypeoffunction:voidStart_I2c();Function:starttheI2Cbus,thatis,sendtheI2Cstartcondition************************************************

5、********************/VoidStart_I2c(){SDA=1;datasignalsending*//*initialcondition_Nop();_Nop();SCL=1;(_Nop);/*initialconditionsfortheestablishmentoftimeisgreaterthan4.7us,delay._Nop();_Nop();_Nop();_Nop();(_Nop);/*initialconditionsfortheestablishmentoftimeisgreaterthan4.7us,d

6、elay._Nop();_Nop();_Nop();_Nop();SDA=0;/**/sendstartsignal(_Nop);/*initialconditionofthelockingtimeofmorethan4mus*/_Nop();_Nop();_Nop();_Nop();(_Nop);/*initialconditionsfortheestablishmentoftimeisgreaterthan4.7us,delay._Nop();_Nop();_Nop();_Nop();SCL=0;/*I2Cgrabbedthebus,rea

7、dytosendorreceivedata._Nop();_Nop();_Nop();_Nop();}/*******************************************************************EndbusfunctionPrototypeoffunction:voidStop_I2c();Function:endtheI2Cbus,thatis,sendtheI2Cendcondition********************************************************

8、************/VoidStop_I2c(){SDA=0;datasignalssentovertheconditions*//*(_Nop)clocksignal;/*sendendconditions(_Nop)clocksignal;/*sendendconditionsSCL=1;/*endtimeconditionsfortheestablishmentofmorethan4mus*/_Nop();_Nop();_Nop();_Nop();_Nop();_Nop();_Nop();_Nop();_Nop();_Nop();S

9、DA=1;/**/I2Cbussendendsignal_Nop();_Nop();_Nop();_Nop();_Nop();_Nop();_Nop(