74HC595的實際應(yīng)用與編程例子

74HC595的實際應(yīng)用與編程（匯編C語言）74HC595具有一個8位串行輸入并行輸出的移位寄存器和一個8位輸出鎖存器。Qi1u16vcc03314%04L±59513]OE512ST[jpQfel611SHCPQy叵10MRGND8&111129152101314

FUNCTION9152101314INPUTSOUTPUTSFUNCTONSHCPSTCpOEMRDsQ/XXLLXLNCaLOWlevelonMRonlyaffectstheshiftreg^&tersX1LLXLLemptyshiftregist&rloadedaniostoragsregisterXXHLXLZshiftregisterclear.Paralleloutputsinhrgh-impedanceOFF-staSeTXLHH缶NClogichighlevelslhifi&dinto-shrftregistersiage0.Cantenlsofallshiflregisterstagesshiftedthrough,e.g.previousstateofstages(iniemalQg')可ppea「&onthes^rsaloutput(□?')XTLHXNCOncontentsofshiftregisterstages(internal□」)aretransferredtothestorageregisterandparalleloutputstagesTTLHX*OncontentsofshiftregistershiftedthrcxjghPreuiouscontentsoftheshiftregisterisiransferredtothestorageregisterandtheparalleloutputstages.Not轉(zhuǎn)1H=HIGHvoltagelevel;L二LOWvgttagelevelt=LOW-to-HIGHtransitioni,l二HIGH-1O-L0WtransibonZ二hEghi-impedanceOFF-state;NC=nochangeX=don'tcare應(yīng)用電路圖:LED51\LEIX&f>n01SRCLR02SER.0304SRCLK<0506RCIK<07EQ7SZ4HC595NE0823P&UnriQ：14D.....b1=-le._-T■應(yīng)用演示程序：============================,============;74HC595走馬燈演示程序；創(chuàng)作日期：2006/01/02;創(chuàng)作者：gguoqingSDATA_595EQUP1.0；串行數(shù)據(jù)輸入SCLK_595EQUP1.1;移位時鐘脈沖RCK_595EQUP1.2；輸出鎖存器控制脈沖;;ORG0000HLJMPMAINORG0030HMAIN:MOVSP,#60HMOVR0,#0FEHMAIN1:CALLOUT_595CALLDELAYMOVA,R0RLAMOVR0,AJMPMAIN1;;輸出鎖存器輸出數(shù)據(jù)子程序OUT_595:LCALLWR_595CLRRCK_595NOPNOPSETBRCK_595；上升沿將數(shù)據(jù)送到輸出鎖存器NOPNOPNOPCLRRCK_595RET；；移位寄存器接收數(shù)據(jù)子程序；;WR_595:MOVR4,#08H;MOVA,R0WR_LOOP:RLCAMOVSDATA_595,CSETBSCLK_595;上升沿發(fā)生移位NOPNOPCLRSCLK_595DJNZR4,WR_LOOPRET;延時子程序DELAY:MOVR5,#03HDEL0:MOVR6,#0FFHDEL1:MOVR7,#0FFHDJNZR7,$DJNZR6,DEL1DJNZR5,DEL0RET■=========================;END電路圖見樓上/**/*74HC595走馬燈演示程序*/*作者：gguoqing*/*時間：2006/02/26*/**/*【聲明】此程序僅用于學(xué)習(xí)與參考，引用請注明版權(quán)和作者信息！*/*******/#include<;reg51.h>//51芯片管腳定義頭文件#include<;intrins.h>〃內(nèi)部包含延時函數(shù)_nop_();#defineucharunsignedchar#defineuintunsignedintucharcodeDAT[8]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};sbitSDATA_595=P1^0;〃串行數(shù)據(jù)輸入sbitSCLK_595=P1^1;〃移位時鐘脈沖sbitRCK_595=P1^2;〃輸出鎖存器控制脈沖uchartemp;/**/

/*延時子程序*/

/**/voiddelay(intms){intk;while(ms--){for(k=0;k<;250;k++){_nop_();_nop_();_nop_();_nop_();/**/

/*將顯示數(shù)據(jù)送入74HC595內(nèi)部移位寄存器*/

/**/voidWR_595(void)

{

ucharj;for(j=0;j<;8;j++)

{

temp=temp<;<;1;SDATA_595=CY;SCLK_595=1;〃上升沿發(fā)生移位

_nop_();

_nop_();SCLK_595=0;}

}/**/

/*將移位寄存器內(nèi)的數(shù)據(jù)鎖存到輸出寄存器并顯示*/

/**/voidOUT_595(void){RCK_595=0;_nop_()；_nop_()；RCK_595=1;〃上升沿將數(shù)據(jù)送到輸出鎖存器_nop_()；_nop_()；_nop_()；RCK_5