STC12LE5616AD datasheet(32/377 Pages) STC

32 / 377 page

2.1.3 How to Know Internal RC Oscillator frequency(Internal clock frequency)

STC 1T MCU 12C5620AD series in addition to traditional external clock, but also the option of using the internal

RC oscillator clock source. If select internal RC oscillator, external crystal can be saved. XTAL1 and XTAL2

floating. Relatively large errors due to internal clock, so high requirements on the timing or circumstances have

serial communication is not recommended to use the internal oscillator. User can use “MOV @Ri” instruction

read RAM unit FC~FF to get the internal oscillator frequency of the factory and read RAM unit F8~FB to get

internal oscillator frequency of last used to download programs within the internal oscillator after power on.

//The following example program written by C language is to read internal R/C clock

frequency

/*----------------------------------------------------------------------------------*/

/* --- STC MCU International Limited -------------------------------------*/

/* If you want to use the program or the program referenced in the --*/

/* article, please specify in which data and procedures from STC --*/

/*---------------------------------------------------------------------------------*/

#include<reg51.h>

#include<intrins.h>

sfr

ISP_CONTR

= 0xE7;

sbit

MCU_Start_Led

= P1^7;

//unsigned

char

self_command_array[4] = {0x22,0x33,0x44,0x55};

#define Self_Define_ISP_Download_Command

0x22

#define RELOAD_COUNT

0xfb

//18.432MHz,12T,SMOD=0,9600bps

void

serial_port_initial();

void

send_UART(unsigned char);

void

UART_Interrupt_Receive(void);

void

soft_reset_to_ISP_Monitor(void);

void

delay(void);

void

display_MCU_Start_Led(void);

void main(void)

{

unsigned char i = 0;

unsigned char j = 0;

unsigned char idata *idata_point;

STC12LE5616AD Datasheet(PDF) 32 Page - STCmicro Technology Co,.Ltd

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