定時(shí)器中斷

1、作者：夏國(guó)清，時(shí)間20091018晚電路圖說(shuō)明：使用段鎖存器和位鎖存器分別控制數(shù)碼管(共陰極)的段選端和位選端，兩個(gè)鎖存器都使用P0口送數(shù)；并分別使用P2.0和P2.1來(lái)控制兩鎖存器的LE鎖存控制端，LE＝1時(shí)選通，LE=0時(shí)鎖存。程序功能：對(duì)數(shù)碼管動(dòng)態(tài)掃描來(lái)顯示數(shù)0到999，使用定時(shí)器0計(jì)時(shí)，使其半秒鐘加數(shù)一次到999加滿(mǎn)自動(dòng)清零重新計(jì)數(shù)。#include#defineuintunsignedint#defineuunsigneduc

2、oded_table[]=0x3f0x060x5b0x4f0x660x6d0x7d0x070x7f0x6f0x770x7c0x390x5e0x790x710x00共陰0～F段碼ucodew_table[]=0xff0xfe0xfd0xfb0xf70xef0xdf16位選碼sbitduan=P2^0sbitwei=P2^1ucount定時(shí)器產(chǎn)生中斷時(shí)加1uintnum存放數(shù)碼管顯示的數(shù)voiddelay(uint)voidinit()對(duì)定

3、時(shí)器0初始化，并對(duì)geshibai初始化voiddisplay(uint)顯示數(shù)voidmain()init()初始化定時(shí)器while(1)if(count==10)半秒鐘到加數(shù)一次count=0numif(num==1000)數(shù)滿(mǎn)清零num=0P0=w_table[2]wei=1wei=0P0=d_table[shi]duan=1duan=0delay(5)個(gè)位數(shù)P0=w_table[3]wei=1wei=0P0=d_table[ge

4、]duan=1duan=0delay(5)voidtimer0_50ms()interrupt1每50ms執(zhí)行一次定時(shí)器中斷處理函數(shù)(因?yàn)槎〞r(shí)器中斷處理函數(shù)中重新裝初值了)TH0=(6553650000)256TL0=(6553650000)%256當(dāng)計(jì)數(shù)值滿(mǎn)65536的時(shí)候就產(chǎn)生定時(shí)器0的中斷，進(jìn)入定時(shí)器中斷1。就是重裝初值，count還有執(zhí)行一次diaplay.count定時(shí)時(shí)間計(jì)數(shù)display(num)在數(shù)碼管上顯示當(dāng)前num值