用ne555做一个99秒的倒计时的计时器，用两个数码管显示出来 求两位数码管显示一个倒数时间的单片机程序,比如显示从99到0
51\u5355\u7247\u673a\u4e24\u4e2a\u5171\u9633\u6570\u7801\u7ba1\u5b9e\u73b099\u79d2\u5012\u8ba1\u65f6\uff0c\u6c42\u7a0b\u5e8f\u53ef\u4ee5\u53c2\u8003\u4e00\u4e0b\u8fd9\u4e2a\u4eff\u771f\u5b9e\u4f8b\uff0c\u4eff\u771f\u8bd5\u8bd5\u3002\u624b\u673a\u7528\u6d4f\u89c8\u5668\u53ef\u89c1\u9644\u4ef6\u3002
//\u4e24\u4f4d\u6570\u7801\u7ba1\u663e\u793a\u5012\u8ba1\u657099~00\uff0c51\u5355\u7247\u673a\u3002
#include // \u5012\u8ba1\u6570
#define uint unsigned int
#define uchar unsigned char
uchar code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
uchar bai,shi;
uint a1,a2;
sbit D1=P3^0; // \u4f4d\u90091 P1\u53e3\u6bb5\u7801\u8f93\u51fa
sbit D2=P3^1; // \u4f4d\u90092
sbit key=P3^7; // \u542f\u52a8/\u505c\u6b62
bit y;
void main()
{
TMOD=0x01;
TH0=(65536-10000)/256;
TL0=(65536-10000)%256;
EA=1;
ET0=1;
TR0=1;
bai=0;
shi=0;
while(1)
{
if(key==0)
{
}
}
}
void timer0()interrupt 1
{
TH0=(65536-10000)/256;
TL0=(65536-10000)%256;
a1++;
y = ~y;
if(a1==100)
{
a1=0;
if(key==1) a2--;
if(a2>=100) a2=99;
}
D1 = 1; D2 = 1;
if(y==1)
{
P1=table[a2/10];
D1=0;
}
else
{
P1=table[a2%10];
D2=0;
}
}
搜一下：用ne555做一个99秒的倒计时的计时器，用两个数码管显示出来
绛旓細NE555涓嶇敤缂栫▼ 鎻愮ず锛氱敤555鍙婄數瀹圭數闃绘瀯鎴愬璋愭尟鑽″櫒 鎸崱鍛ㄦ湡鏄1s 璁℃暟鍣ㄥ彲浠ラ夋嫨74ls90鎴栬74ls192 锛岃瘧鐮佸櫒鏄痗d4511 鐒跺悗閫夋嫨鐩稿簲鐨勬暟鐮佺鐨勫氨鍙互浜 璁℃暟鍣ㄩ兘鏈夋竻闆剁 鐢ㄤ釜寮鍏虫帶鍒舵竻闆剁灏卞彲浠ヤ簡 鎶ヨ鐢佃矾鍙互鐢ㄤ笁鏋佺鎺у埗铚傞福鍣
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绛旓細闆嗘垚鐢佃矾 74LS148鈥1鐗,74LS279鈥1鐗,74LS48鈥3鐗,74LS192鈥2鐗,NE555鈥2鐗,74LS00鈥1鐗,74LS121鈥1鐗囥傜數闃510惟鈥2鍙,1K惟鈥9鍙,4.7k惟鈥攍鍙,5.1k惟鈥攍鍙,100k惟鈥攍鍙,10k惟鈥1鍙,15k惟鈥1鍙, 68k惟鈥攍鍙傜數瀹0.1uF鈥1鍙,10 uF鈥2鍙,100 uF鈥1鍙備笁鏋佺 3DG12鈥1鍙傚叾瀹 鍙戝厜...
绛旓細鏈璁℃槸浠555鏋勬垚闇囪崱鐢佃矾锛岀敱74LS192鏉ュ厖褰撹鏁板櫒锛屾瀯鎴怤BA24绉掑掕鏃剁數璺傝鐢佃矾绠鍗曪紝鏃犻渶鐢ㄥ埌鏅舵尟锛岃姱鐗囬兘鏄競鍦轰笂瀹规槗璐緱鐨勩傝璁″姛鑳藉畬鍠勶紝鑳藉疄鐜扮洿鎺ユ竻闆躲佸惎鍔ㄥ拰鏆傚仠/杩炵画璁℃椂锛岃繕鍏锋湁鎶ヨ鍔熻兘銆備竴銆佽璁″師鐞嗕笌鐢佃矾 鍘熺悊鏂规鍥惧浘锛氬寘鎷鑴夊啿鍙戠敓鍣ㄣ佽鏁板櫒銆佽瘧鐮佷笌鏄剧ず鐢佃矾銆佹姤璀︾數璺拰鎺у埗...
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