串口通信程序 单片机

FIFO allows UART1 to receive up to three data bytes before data is lost and an overflow occurs.
UART1 has six associated SFRs. Three are used for the Baud Rate Generator (SBCON1, SBRLH1, and
from the Transmit Holding Register.
With UART1 interrupts enabled, an interrupt is generated each time a transmit is completed (TI1 is set in
SCON1), or a data byte has been received (RI1 is set in SCON1). The UART1 interrupt flags are not
C8051F340串口通信程序（UART1)/***************************************************************
UART1 is an asynchronous, full duplex serial port offering a variety of data formatting options. A dedicated
Interrupts_Init();
}
void UART1_Send_data(unsigned char Send_data)// /helloelectron
{
SBUF1=Send_data;
complete). Note that if additional bytes are available in the Receive FIFO, the RI1 bit cannot be cleared by
software.
****************************************************************/
The procedure for configuring and enabling
the 4x Clock Multiplier is as follows:
1. Reset the Multiplier by writing 0x00 to register CLKMUL.
while ((!CLKMUL &( 1<<5 ))); //Poll for MULRDY => ‘1’ 6
CLKSEL = 0x03;//USB clock: 48MHz, system clock : 48MHz
}
// Initialization function for device,
2. Select the Multiplier input source via the MULSEL bits.
3. Enable the Multiplier with the MULEN bit (CLKMUL | = 0x80).
4. Delay for >5 μs.
holding register and the receive FIFO. Writes to SBUF1 always access the Transmit Holding Register.
Reads of SBUF1 always access the first byte of the Receive FIFO; it is not possible to read data
code char MyBlog[]="/helloelectron\n";
unsigned int Byte,Stringlen;
unsigned int leddata;
bit read_flag;
// SCON1 0xD2
5. Initialize the Multiplier with the MULINIT bit (CLKMUL | = 0xC0).
6. Poll for MULRDY => ‘1’.
*/
CLKMUL = 0x00;// 1
CLKMUL = 0x00; //Select Internal Oscillator 2
P0SKIP = 0x0F;
// enable crossbar
XBR1 = 0x40;
// enable UART1
XBR2 = 0x01; Nhomakorabea} /**************Interrupts_Init****************/
CLKMUL |= ( 1<<7 );//Clock Multiplier enabled.MULEN=1,0x80 3
for (i = 0; i < 20; i++); // Wait 5us for initialization 4
CLKMUL |= ( 1<<6 ) | ( 1<<7 );//Initialize the Multiplier with the MULINIT bit (CLKMUL | = 0xC0) 5
P2=LED_Charecter[leddata%1000/100];
HC138Sel_com3();
Delay(10);
P2=LED_Charecter[leddata/1000];
HC138Sel_com4();
Delay(10);
}
/************************************
/*****UART1*****/
#include "C8051F340.h"
#include "MyDef.h"
#include <string.h>
code unsigned char LED_Charecter[] = { 0xC0, 0xf9, 0xA4, 0xB0, 0x99, 0x92, 0X82, 0xF8, 0x80, 0x90};
// P0.0 - Skipped, Open-Drain, Digital
// P0.1 - Skipped, Open-Drain, Digital
// P0.2 - Skipped, Open-Drain, Digital
// P0.3 - Skipped, Open-Drain, Digital
baud rate generator with a 16-bit timer and selectable prescaler is included, which can generate a wide
range of baud rates (details in Section “19.1. Baud Rate Generator” on page 220). A received data
{
HC138Sel_com1();
P2=LED_Charecter[leddata%10];
HC138Sel_com1();
Delay(10);
P2=LED_Charecter[leddata%100/10];
HC138Sel_com2();
Delay(10);
void Interrupts_Init()
{
EIE2 = 0x02;//Enable UART1 interrupt
IE = 0x80;//EA=1
}
/*****Initialize display_led***********/
void display_led(unsigned int leddata)
SBRLL1), two are used for data formatting, control, and status functions (SCON1, SMOD1), and one is
used to send and receive data (SBUF1). The single SBUF1 location provides access to both the transmit
SCON1 = 0x10;
//SB1RUN=1 Baud Rate Generator is enabled.
//SB1PS1 SB1PS0 11: Prescaler = 1
SBCON1 = 0x43;
//8位数据位，无奇偶校验，一位停止位
SMOD1 =0X6C;
OSCICL = 0x00;//(00000b)the oscillator operates at its fastest setting
/*
The 4x Clock Multiplier is configured via the CLKMUL register.
void Delay(unsigned int x)
{
unsigned int a,b;
for(a=x;a>0;a--)
for(b=100;b>0;b--);
}
// Peripheral specific initialization functions,
void Port_IO_Init()
cleared by hardware when the CPU vectors to the interrupt service routine. They must be cleared manually