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????????UART??????????????????????????????????????????????????????????????????????????????????
????????????????
1. ?????????????????????
2. ????????????SBUF registers??????
3. ???????????????????????????
4. ?????????????????????????
5. ?????????????1????2?????????
6. ?????????????????????
??????????????????????????????????????????????????????????????
?????????
```c
void delay(long d) {
    while(d--) ;
}
void uar1tByte(char byte) {
    SBUF = byte;
    while(!TI);
    TI = 0;
}
void uart1String(char *s) {
    while(*s) {
        uar1tByte(*s++);
    }
}
void uart1Figure(long figure) {
    if(figure >= 100000000) uart1tByte('0' + figure/100000000%10);
    if(figure >= 10000000) uart1tByte('0' + figure/10000000%10);
    if(figure >= 1000000) uart1tByte('0' + figure/1000000%10);
    if(figure >= 100000) uart1tByte('0' + figure/100000%10);
    if(figure >= 10000) uart1tByte('0' + figure/10000%10);
    if(figure >= 1000) uart1tByte('0' + figure/1000%10);
    if(figure >= 100) uart1tByte('0' + figure/100%10);
    if(figure >= 10) uart1tByte('0' + figure/10%10);
    if(figure >= 0) uart1tByte('0' + figure/1%10);
}
void uart1TiINIT() {
    unsigned int INITValue = 256 - (11059200/12/32/9600);
    EA = 1; ES = 1; SCON = 0x50; TMOD = 0x0F;
    TMOD |= 0x20; TH1 = TL1 = INITValue; ET1 = 0; TR1 = 1;
}
void uart1T2INIT() {
    unsigned int INITValue = 65536 - (11059200/32/9600);
    EA = 1; ES = 1; SCON = 0x50; T2CON = 0x34;
    TH2 = RCAP2H = INITValue / 256; TL2 = RCAP2L = INITValue % 256; TR2 = 1;
}
int main() {
    uart1T2INIT();
    while(1) {
        i++;
        uart1String("i = ");
        uart1Figure(i);
        uart1String("\r\n");
        delay(10000);
    }
}

????????UART?????????????????????????????

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