STC12C5A60S2 dual serial port communication

The STC12C5A60S2 microcontroller is a powerful microcontroller. It has two full-duplex serial communication interfaces. The functions and operations of serial port 1 are the same as those of the traditional 51 microcontroller serial port. What is special is that there is an independent baud rate generator inside the STC12C5A60S2 microcontroller. Serial port 1 can use timer 1 as the baud rate generator, or use an independent baud rate generator as the baud rate generator; while serial port 2 can only use an independent baud rate generator as the baud rate generator.

The following is a dual serial port communication program:

/****************************************************** ************************

Date: 2012.11.24

Chip: STC12C5A60S2

Crystal: 22.1184MHz  Baud rate: 9600bps

Pin definition: Serial port 1: Send————TxD/P3.1; Receive————RxD/P3.0

    Serial port 2: Send————TxD2/P1.3; Receive————RxD2/P1.2

Function description: STC12 dual serial port communication (interrupt mode)

          When serial port 1 receives data, it sends the data out through serial port 2

          When serial port 2 receives data, it sends the data out through serial port 1

*************************************************** *********************/

#include

#define S2RI 0x01 //Serial port 2 receive interrupt request flag

#define S2TI 0x02 //Serial port 2 sends interrupt request flag

unsigned char flag1,flag2,temp1,temp2;

/****************Serial port initialization function****************/

void InitUART(void)

{

    TMOD = 0x20; //Timer 1 works in mode 2 8-bit automatic reload

    SCON = 0x50; //Serial port 1 works in mode 1 10-bit asynchronous transmission REN = 1 allows reception

    TH1 = 0xFA;    //Timer 1 initial value

    TL1 = TH1;

    TR1 = 1;    //Timer 1 starts counting

    EA =1; //Open the general interrupt

    ES =1; //Open serial port 1 interrupt

    S2CON = 0x50; //Serial port 2 works in mode 1 10-bit asynchronous transmission S2REN = 1 allows reception

    BRT = 0xFA;    //Independent baud rate generator initial value

    AUXR = 0x10; //BRTR=1 independent baud rate generator starts counting

    IE2 = 0x01; //Open serial port 2 interrupt ES2 = 1

}

/********************Serial port 1 sends********************/

void UART_1SendOneByte(unsigned char c)

{

    SBUF = c;

    while(!TI);    //If TI=0, wait here

    TI = 0;  

}

/********************Serial port 2 sends********************/

void UART_2SendOneByte(unsigned char c)

{

    S2BUF = c;

    while(!(S2CON&S2TI)); //If S2TI=0, wait here

    S2CON&=~S2TI;   //S2TI=0

}

/*********************Main function******************/

void main(void)

{

    InitUART(); //Serial port initialization

while(1)

{

//If serial port 1 receives data, send this data through serial port 2

if(flag1==1)

{

flag1=0;

UART_2SendOneByte(temp1);

}

//If serial port 2 receives data, send this data from serial port 1

if(flag2==1)

{

flag2=0;

UART_2SendOneByte(temp2);

}

}

}

/************Serial port 1 interrupt processing function****************/

void UART_1Interrupt(void) interrupt 4

{

if(RI==1)

{

RI=0;

flag1=1;

temp1=SBUF;

}

}

/************Serial port 2 interrupt processing function*************/

void UART_2Interrupt(void) interrupt 8

{

if(S2CON&S2RI)

{

S2CON&=~S2RI;

flag2=1;

temp2=S2BUF;

} 

}

The header file of 12C5A60S2.h is as follows:

//------------------------------------------------ --------------------------------

//New generation 1T 8051 series microcontroller core special function registers C51 Core SFRs

// 7 6 5 4 3 2 1 0 Reset Value

sfr ACC = 0xE0; //Accumulator 0000,0000

sfr B = 0xF0; //B Register 0000,0000

sfr PSW = 0xD0; //Program Status Word CY AC F0 RS1 RS0 OV F1 P 0000,0000

//----------------------------------

sbit CY = PSW^7;

sbit AC = PSW^6;

sbit F0 = PSW^5;

sbit RS1 = PSW^4;

sbit RS0 = PSW^3;

sbit OV = PSW^2;

sbit P = PSW^0;

//----------------------------------

sfr SP = 0x81; //Stack Pointer 0000,0111

sfr DPL = 0x82; //Data Pointer Low Byte 0000,0000

sfr DPH = 0x83; //Data Pointer High Byte 0000,0000

//------------------------------------------------ --------------------------------

// New generation 1T 8051 series MCU system management special function register

// 7 6 5 4 3 2 1 0 Reset Value

sfr PCON = 0x87; //Power Control SMOD SMOD0 LVDF POF GF1 GF0 PD IDL 0001,0000

// 7 6 5 4 3 2 1 0 Reset Value

sfr AUXR = 0x8E; //Auxiliary Register T0x12 T1x12 UART_M0x6 BRTR S2SMOD BRTx12 EXTRAM S1BRS 0000,0000

//----------------------------------

sfr AUXR1 = 0xA2; //Auxiliary Register 1 - PCA_P4 SPI_P4 S2_P4 GF2 ADRJ - DPS 0000,0000

/*

PCA_P4:

    0, default PCA is at P1 port

    1. PCA/PWM switches from P1 to P4: ECI switches from P1.2 to P4.1.

                                   PCA0/PWM0 switches from P1.3 to P4.2

                                   PCA1/PWM1 switches from P1.4 to P4.3

SPI_P4:

    0, default SPI is on P1 port

    1. SPI switches from P1 to P4: SPICLK switches from P1.7 to P4.3

                               MISO switches from P1.6 to P4.2

                               MOSI switches from P1.5 to P4.1

                               SS switches from P1.4 to P4.0

S2_P4: 

    0, default UART2 is on P1 port

    1. UART2 switches from P1 to P4: TxD2 switches from P1.3 to P4.3

                                 RxD2 switches from P1.2 to P4.2

GF2: General flag bit

ADRJ:

    0, The high 8 bits of the 10-bit A/D conversion result are placed in the ADC_RES register, and the low 2 bits are placed in the ADC_RESL register

    1. The highest 2 bits of the 10-bit A/D conversion result are placed in the lower 2 bits of the ADC_RES register, and the lower 8 bits are placed in the ADC_RESL register.

DPS: 0, use the default data pointer DPTR0

     1. Use another data pointer DPTR1

*/

//----------------------------------

sfr WAKE_CLKO = 0x8F; //Additional SFR WAK1_CLKO

/*

      7 6 5 4 3 2 1 0 Reset Value

   PCAWAKEUP RXD_PIN_IE T1_PIN_IE T0_PIN_IE LVD_WAKE _ T1CLKO T0CLKO 0000,0000B

b7 - PCAWAKEUP : PCA interrupt can wake up powerdown.

b6 - RXD_PIN_IE : When the falling edge of P3.0 (RXD) sets RI, it can wake up the powerdown (the corresponding interrupt must be enabled).

b5 - T1_PIN_IE : When the falling edge of T1 pin sets T1 interrupt flag, it can wake up the powerdown (the corresponding interrupt must be enabled).

b4 - T0_PIN_IE : When the falling edge of T0 pin sets T0 interrupt flag, it can wake up the powerdown (the corresponding interrupt must be enabled).

b3 - LVD_WAKE : When the CMPIN pin is low, the LVD interrupt flag is set to wake up the powerdown (the corresponding interrupt must be enabled).

b2 - 

b1 - T1CLKO: Enable T1CKO (P3.5) pin to output T1 overflow pulse, Fck1 = 1/2 T1 overflow rate

b0 - T0CLKO : Enable T0CKO (P3.4) pin to output T0 overflow pulse, Fck0 = 1/2 T1 overflow rate

*/

//----------------------------------

sfr CLK_DIV = 0x97; //Clock Divder - - - - - CLKS2 CLKS1 CLKS0 xxxx,x000

//----------------------------------

sfr BUS_SPEED = 0xA1; //Stretch register - - ALES1 ALES0 - RWS2 RWS1 RWS0 xx10,x011

/*

ALES1 and ALES0:

00: The P0 address setup time and hold time to ALE negative edge is one clock cycle

01 : The P0 address setup time and hold time to ALE negative edge are two clock cycles.

10: The P0 address setup time and hold time to ALE negative edge is three clock cycles. (default)

11: The P0 address setup time and hold time to ALE negative edge is four clock cycles.

RWS2, RWS1, RWS0:

  000 : The MOVX read/write pulse is 1 clock cycle. 

  001 : The MOVX read/write pulse is 2 clock cycles.

  010 : The MOVX read/write pulse is 3 clock cycles.

  011 : The MOVX read/write pulse is 4 clock cycles. (default)

  100: The MOVX read/write pulse is 5 clock cycles.

  101 : The MOVX read/write pulse is 6 clock cycles.

  110 : The MOVX read/write pulse is 7 clock cycles.

  111: The MOVX read/write pulse is 8 clock cycles.

*/

//------------------------------------------------ --------------------------------

//New generation 1T 8051 series microcontroller interrupt special function register

//Some interrupt control and interrupt flag bits are scattered in other special function registers. These bits are defined in the bit address

//Some of the bits have no bit addressing capability, please refer to the Chinese guide for the new generation 1T 8051 series microcontrollers

// 7 6 5 4 3 2 1 0 Reset Value

sfr IE = 0xA8; //Interrupt control register EA ELVD EADC ES ET1 EX1 ET0 EX0 0x00,0000

//-----------------------

sbit EA = IE^7;

sbit ELVD = IE^6; //Low voltage monitoring interrupt enable bit

sbit EADC = IE^5; //ADC interrupt enable bit

sbit ES = IE^4;

sbit ET1 = IE^3;

sbit EX1 = IE^2;

sbit ET0 = IE^1;

sbit EX0 = IE^0;

//-----------------------

sfr IE2 = 0xAF; //Auxiliary Interrupt - - - - - - ESPI ES2 0000,0000B

//-----------------------

// 7 6 5 4 3 2 1 0 Reset Value

sfr IP = 0xB8; //Interrupt priority low PPCA PLVD PADC PS PT1 PX1 PT0 PX0 0000,0000

//--------

sbit PPCA = IP^7; //PCA module interrupt priority

sbit PLVD = IP^6; //low voltage monitoring interrupt priority

sbit PADC = IP^5; //ADC interrupt priority

sbit PS = IP^4;

sbit PT1 = IP^3;

sbit PX1 = IP^2;

sbit PT0 = IP^1;

sbit PX0 = IP^0;

//-----------------------

// 7 6 5 4 3 2 1 0 Reset Value

sfr IPH = 0xB7; //Interrupt priority high PPCAH PLVDH PADCH PSH PT1H PX1H PT0H PX0H 0000,0000

sfr IP2 = 0xB5; // - - - - - - PSPI PS2 xxxx,xx00

sfr IPH2 = 0xB6; // - - - - - - PSPIH PS2H xxxx,xx00

//-----------------------

//New generation 1T 8051 series MCU I/O port special function register

// 7 6 5 4 3 2 1 0 Reset Value

sfr P0 = 0x80; //8 bitPort0 P0.7 P0.6 P0.5 P0.4 P0.3 P0.2 P0.1 P0.0 1111,1111

sfr P0M0 = 0x94; // 0000,0000

sfr P0M1 = 0x93; // 0000,0000

sfr P1 = 0x90; //8 bitPort1 P1.7 P1.6 P1.5 P1.4 P1.3 P1.2 P1.1 P1.0 1111,1111

sfr P1M0 = 0x92; // 0000,0000

sfr P1M1 = 0x91; // 0000,0000

sfr P1ASF = 0x9D; //P1 analog special function

sfr P2 = 0xA0; //8 bitPort2 P2.7 P2.6 P2.5 P2.4 P2.3 P2.2 P2.1 P2.0 1111,1111

sfr P2M0 = 0x96; // 0000,0000

sfr P2M1 = 0x95; // 0000,0000

sfr P3 = 0xB0; //8 bitPort3 P3.7 P3.6 P3.5 P3.4 P3.3 P3.2 P3.1 P3.0 1111,1111

sfr P3M0 = 0xB2; // 0000,0000

sfr P3M1 = 0xB1; // 0000,0000

sfr P4 = 0xC0; //8 bitPort4 P4.7 P4.6 P4.5 P4.4 P4.3 P4.2 P4.1 P4.0 1111,1111