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cludeltreg52hgt51头文件r
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cludelt472405468hgt51头文件r
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defi
eucharu
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edchar宏定义r
defi
eui
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t宏定义r
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defi
es0P20时加键r
defi
es1P21分加键r
defi
es2P22t倒时加键tttttt0x3f0x060x5b0x4f0x660x6d0x7d0x070x7f0x6Fr
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es3P23倒分加键r
defi
es4P24倒秒加键r
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es5P25开始倒计时键t总共6个按键r
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ttt1tt0r
uchar
um0r
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ucharbiaozhi11r
ucharupr
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um1函数变量声明r
charshife
miaopao_miao定义有符号变量声明r
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chardao_shi23dao_miao59dao_fe
59dao_paomiao99r
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sbitsky1P10断控r
sbitsky2P11位控r
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gP12控蜂鸣器r
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co
stucharcodeTAB0x3f0x060x5b0x4f0x660x6d0x7d0x070x7f0x6f共阴极显示代码r
函数声明r
voidfe
g_mi
g_qiuchar报时函数r
voidi
it定时器的初始化（T1）r
voidfe
jie函数声明r
voiddelayuchar延时函数声明r
voiddao_fe
jiet倒计时显示函数r
ucharkey_sca
t按键调试函数r
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voiddelayucharz一毫秒延时函数r
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ucharxyr
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fory0ylt110yr
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voidi
itTR1初始化r
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TMOD0x22TMOD0x20开定时1r
TH10x06T1250微妙r
TL10x06装初值r
EA1打开总中断r
TR11t初始化先打开定时器1r
ET11r
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TH00x06T0也是250微妙中断一次r
TL00x06装初值r
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TR00初始化先关闭定时器0r
ET01IEr
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IP0x20r
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voiddao_fe
jie分解倒秒，倒分，倒时。控制8个数码管显示倒时间r
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uchardao_gge2dao_gge1dao_ffe
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1dao_sshi2dao_sshi1dao_pao1dao_pao2局部变量r
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dao_pao1dao_paomiao10r
dao_pao2dao_paomiao10r
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dao_gge1dao_miao10r
dao_gge2dao_miao10r
dao_ffe
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dao_sshi1dao_shi10r
dao_sshi2dao_shi10倒时倒分倒秒的分解r
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0ampampdao_shi0蜂鸣器20秒的报时r
tr
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TR00r
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g_mi
g_qi3每次进行倒计时的时候都让
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biaozhi11r
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P00xffr
sky10断控r
P0TABdao_pao1倒跑秒的个位r
sky11r
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sky20r
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delay5r
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sky10r
P0TABdao_pao2r
sky11r
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sky20r
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delay5t倒跑秒的十位r
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