51單片機-時鐘芯片DS1302
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void delay(uint t){
int i,j;
for(i = 0; i ＜ t; i++)
for(j = 10; j ＞ 0; j--)
;
}
void lcd_com(uchar s){
RS = 0; //低電平，寫指令
P2 = s; //傳數(shù)據(jù)
delay(14); //看時序圖，數(shù)據(jù)需要穩(wěn)定一段時間
E = 1; //給一個高脈沖，發(fā)送命令
delay(14); //如圖，高脈沖延時一段時間，確保命令發(fā)送
E = 0; //發(fā)送結(jié)束E置為低電平
}
void lcd_data(uchar s){
RS = 1;
P2 = s;
delay(14);
E = 1;
delay(14);
E = 0;
}
uchar DS_Read(uchar command){
uchar value;
RST = 0;
SCLK = 0;
RST = 1;
value = 0x0;
for(i = 0; i ＜ 8; i++){
IO = command & 0x01; //寫入控制字
SCLK = 0;
SCLK = 1;
command ＞＞= 1;
}
for(i = 0; i ＜ 8; i++){
SCLK = 1;
SCLK = 0;
if(IO)
value |= (0x01＜＜i); //如果那位是1則value置1
}
RST = 0;
value = value/16*10 + value%16; //BCD碼到十進制的轉(zhuǎn)換
return value;
}
void DS_Write(uchar command,uchar value){
RST = 0;
SCLK = 0;
RST = 1;
for(i = 0; i ＜ 8; i++){ //寫控制字
IO = command & 0x01;
SCLK = 0;
SCLK = 1;
command ＞＞= 1;
}
for(i = 0; i ＜ 8; i++){ //向IO引腳寫數(shù)據(jù)
IO = value & 0x01;
SCLK = 0;
SCLK = 1;
value ＞＞= 1;
}
}
void Init_ds(){
RST = 0;
SCLK = 0;
RST = 1;
DS_Write(0x8E,0x00); //打開寫保護，WP位置0，這樣就可以寫數(shù)據(jù)了
DS_Write(0x84,0x00); //對日歷時鐘寄存器的初始化
DS_Write(0x8c,0x10);
DS_Write(0x8a,0x05);
DS_Write(0x88,0x10);
DS_Write(0x86,0x01);
DS_Write(0x84,0x04);
DS_Write(0x82,0x22);
DS_Write(0x80,0x00); //啟動時鐘
DS_Write(0x8e,0x80); //禁止寄存器寫
}
void Init_lcd(){
RS = 1; //先發(fā)指令，在初始時刻RS是高,E和RW是低
E = 0;
RW = 0;
lcd_com(0x38); //設置為16*2顯示，5*7點陣，8位數(shù)據(jù)接口
lcd_com(0x0f); //開顯示，顯示光標，光標閃爍
lcd_com(0x06); //讀寫一個字符后地址指針加一
lcd_com(0x01);
}
void Display_lcd(uchar y, uchar x, uchar value){
if(y)
lcd_com(0x80+0x40+x); //如果y為1，寫在第二行
else
lcd_com(0x80+x);
lcd_data(value); //寫到LCD602上
}
void main(){
Init_ds();
Init_lcd();
while(1){
Display_lcd(0,0,2);
Display_lcd(0,1,0);
Display_lcd(0,2,Time_Data[DS_Read(0x8D)/10]);
Display_lcd(0,3,Time_Data[DS_Read(0x8D)%10]);
Display_lcd(0,4,-);
Display_lcd(0,5,Time_Data[DS_Read(0x89)/10]);
Display_lcd(0,6,Time_Data[DS_Read(0x89)%10]);
Display_lcd(0,7,-);
Display_lcd(0,8,Time_Data[DS_Read(0x87)/10]);
Display_lcd(0,9,Time_Data[DS_Read(0x87)%10]);
Display_lcd(0,10,D);
Display_lcd(0,11,a);
Display_lcd(0,12,y);
Display_lcd(0,13,:);
Display_lcd(0,14,Time_Data[DS_Read(0x8b)/10]);
Display_lcd(0,15,Time_Data[DS_Read(0x8b)%10]);
Display_lcd(1,0,C);
Display_lcd(1,1,a);
Display_lcd(1,2,n);
Display_lcd(1,3,u);
Display_lcd(1,4,t);
Display_lcd(1,5,e);
Display_lcd(1,6, );
Display_lcd(1,7,Time_Data[DS_Read(0x85)/10]);
Display_lcd(1,8,Time_Data[DS_Read(0x85)%10]);
Display_lcd(1,9,:);
Display_lcd(1,10,Time_Data[DS_Read(0x83)/10]);
Display_lcd(1,11,Time_Data[DS_Read(0x83)%10]);
Display_lcd(1,12,:);
Display_lcd(1,13,Time_Data[DS_Read(0x81)/10]);
Display_lcd(1,14,Time_Data[DS_Read(0x81)%10]);
}
}
//2010-10-1 Day:5
//Canute 04:22:00
DS1302中的RAM:
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