51單片機（V51）————靜態數碼管和動態數碼管
- 一、基本知識
- （1）鎖存
- （2）電路圖看段選和位選
- （3）共陽極數碼管與共陰極數碼管
- 二、靜態數碼管
- 三、動態數碼管
一、基本知識
（1）鎖存
鎖存芯片的作用：保存上一狀態值先給他賦值1，【使能端為高】，讓我們要顯示的數值通過，再給他賦值0，【使能端為低】，就可以鎖住數值
（2）電路圖看段選和位選
在BSTV51單片機中 P2^6 這個串口是段選，控制那一個數字的具體顯示，可根據字形表對應輸出 P2^7 是位選，選擇控制要哪一位亮燈
（3）共陽極數碼管與共陰極數碼管
- 共陰極–輸出低電平0，點亮
- 共陽極–輸出高電平點亮
- 共有十個引腳，2個接地GND
二、靜態數碼管
- 靜態顯示的連接方式、靜態顯示的優缺點（優點：不需要動態重繪；缺點：占用IO口線多）
- 動態顯示的連接方式（所有位數碼管的段選線并聯在一起，由 位選線控制是哪一位數碼管有效）、動態顯示的優缺點（缺點：需要動態重繪；優點：占用IO口線少）
#include<reg52.h>
sbit DUAN = P2^6;
sbit WEI = P2^7;
void main()
{
P0 = 0x7d; // 1111 1110
DUAN = 1;
DUAN = 0;
P0 = 0x00;
WEI = 1;
WEI = 0;
/* P0 = 0x7c; // 1111 1110
DUAN = 1;
DUAN = 0;
P0 = 0xfd;
WEI = 1;
WEI = 0; */
}
三、動態數碼管
用延遲函式
#include<reg52.h>
sbit DUAN = P2^6;
sbit WEI = P2^7;
void delay(unsigned int xms)
{
unsigned int i,j;
for(i=xms;i>0;i--)
for(j=112;j>0;j--);
}
unsigned code sz[17] = { 0x3f,0x06,0x5b,0x4f,0x66,0x6d,
0x7d,0x07,0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71,0x00
};
void main()
{
while(1)
{
P0 = sz[1]; // 數字1
DUAN = 1; // 一端上電
DUAN = 0; // 斷開
P0 = 0xfe;
WEI = 1; // 另一端上高電平
WEI = 0; // 另一端斷開
delay(200);
P0 = sz[2]; // 數字2
DUAN = 1;
DUAN = 0;
P0 = 0xfd;
WEI = 1;
WEI = 0;
delay(200);
P0 = sz[3]; // 數字3
DUAN = 1;
DUAN = 0;
P0 = 0xfb;
WEI = 1;
WEI = 0;
delay(200);
P0 = sz[4]; // 數字4
DUAN = 1;
DUAN = 0;
P0 = 0xf7;
WEI = 1;
WEI = 0;
delay(200);
P0 = sz[5]; // 數字5
DUAN = 1;
DUAN = 0;
P0 = 0xef;
WEI = 1;
WEI = 0;
delay(200);
P0 = sz[6]; // 數字6
DUAN = 1;
DUAN = 0;
P0 = 0xdf;
WEI = 1;
WEI = 0;
delay(200);
P0 = sz[7]; // 數字7
DUAN = 1;
DUAN = 0;
P0 = 0xbf;
WEI = 1;
WEI = 0;
delay(200);
P0 = sz[8]; // 數字8
DUAN = 1;
DUAN = 0;
P0 = 0x7f;
WEI = 1;
WEI = 0;
delay(200);
P0 = sz[8]; // 數字8
DUAN = 1;
DUAN = 0;
P0 = 0x7f;
WEI = 1;
WEI = 0;
delay(200);
P0 = sz[7]; // 數字7
DUAN = 1;
DUAN = 0;
P0 = 0xbf;
WEI = 1;
WEI = 0;
delay(200);
P0 = sz[6]; // 數字6
DUAN = 1;
DUAN = 0;
P0 = 0xdf;
WEI = 1;
WEI = 0;
delay(200);
P0 = sz[5]; // 數字5
DUAN = 1;
DUAN = 0;
P0 = 0xef;
WEI = 1;
WEI = 0;
delay(200);
P0 = sz[4]; // 數字4
DUAN = 1;
DUAN = 0;
P0 = 0xf7;
WEI = 1;
WEI = 0;
delay(200);
P0 = sz[3]; // 數字3
DUAN = 1;
DUAN = 0;
P0 = 0xfb;
WEI = 1;
WEI = 0;
delay(200);
P0 = sz[2]; // 數字2
DUAN = 1;
DUAN = 0;
P0 = 0xfd;
WEI = 1;
WEI = 0;
delay(200);
P0 = sz[1]; // 數字1
DUAN = 1;
DUAN = 0;
P0 = 0xfe;
WEI = 1;
WEI = 0;
delay(200);
}
}
不用延遲函式
#include<reg52.h>
sbit DUAN = P2^6;
sbit WEI = P2^7;
unsigned code sz[17] = { 0x3f,0x06,0x5b,0x4f,0x66,0x6d,
0x7d,0x07,0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71,0x00
};
void main()
{
while(1)
{
P0 = sz[1]; // 數字1
DUAN = 1; // 一端上電
DUAN = 0; // 斷開
P0 = 0xfe;
WEI = 1; // 另一端上高電平
WEI = 0; // 另一端斷開
P0 = 0xff; // 不用延遲函式需要開一個關一個才能保證不亂碼
WEI = 1;
WEI = 0;
P0 = sz[2]; // 數字2
DUAN = 1;
DUAN = 0;
P0 = 0xfd;
WEI = 1;
WEI = 0;
P0 = 0xff;
WEI = 1;
WEI = 0;
P0 = sz[3]; // 數字3
DUAN = 1;
DUAN = 0;
P0 = 0xfb;
WEI = 1;
WEI = 0;
P0 = 0xff;
WEI = 1;
WEI = 0;
P0 = sz[4]; // 數字4
DUAN = 1;
DUAN = 0;
P0 = 0xf7;
WEI = 1;
WEI = 0;
P0 = 0xff;
WEI = 1;
WEI = 0;
P0 = sz[5]; // 數字5
DUAN = 1;
DUAN = 0;
P0 = 0xef;
WEI = 1;
WEI = 0;
P0 = 0xff;
WEI = 1;
WEI = 0;
P0 = sz[6]; // 數字6
DUAN = 1;
DUAN = 0;
P0 = 0xdf;
WEI = 1;
WEI = 0;
P0 = 0xff;
WEI = 1;
WEI = 0;
P0 = sz[7]; // 數字7
DUAN = 1;
DUAN = 0;
P0 = 0xbf;
WEI = 1;
WEI = 0;
P0 = 0xff;
WEI = 1;
WEI = 0;
P0 = sz[8]; // 數字8
DUAN = 1;
DUAN = 0;
P0 = 0x7f;
WEI = 1;
WEI = 0;
P0 = 0xff;
WEI = 1;
WEI = 0;
}
}
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