DASAR 8 : UART - RS232

#include <at89x51.h>
#include <STRING.H>

int dly_stone;

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

void InitTimer0(void)
{
TL0  = 0xFF;  // 10 ms 
TH0  = 0xDB;
TMOD = 0x01;  // mode 1
TR0=1;    // timer-0 On
}
//------------------------------------------------

int dly_stone;

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

void InitTimer1(void)
{
TL1  = 0xFD;  // 10 ms 
TH1  = 0xFD;
TMOD |= 0x20;  // mode 1
TR1=1;    // timer-0 On
}
//------------------------------------------------

void Init_UART9600(void)
{
PCON  = 0x00;  
SCON  = 0x50; // 8 bit serial mode 1 untuk baud rate serial data transfer
}
//------------------------------------------------

void SendData(unsigned char sdata)
{
SCON &= 0xFD;  /* SCON.TI reset/clear by software */
SBUF = sdata;
while((SCON & 0x02) == 0x00);
}
//----------------------------------------------

char ReceiveData(unsigned char rdata)
{
ACC = SCON;
if((ACC & 0x01)==0x00)
 {
 return 0;  /* SCON.RI indikator receive data baru */
 }
rdata=SBUF;
SCON &= 0xFE;
return 1;
}
//------------------------------------------
unsigned char sbyte;

void main(void)
{
InitTimer1();
InitTimer0();
Init_UART9600();
SendData('T');
SendData('E');
SendData('D');
SendData('C');
ReceiveData(sbyte);

}

DASAR 7 ; Port 1 sbg KEYPAD port

* =================================================================
Nama : Praktek4
Fungsi :-Mengenal manipulasi outport, shif register pass parameter. 
 -Memanfaatkan sistem Timer untuk time delay
 -Memanfaat sistem interupt timer untuk time delay
 -Memanfaatkan Port1 sebagai input port 
 -Port1 sebagai input bilangan desimal 2 digit
===================================================================*/

#include <at89x52.h>
#include <STRING.H>

int dly_stone;

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

void InitTimer0(void)
{
TL0  = 0xFF;  // 10 ms 
TH0  = 0xDB;
TMOD = 0x01;  // mode 1
TR0=1;    // timer-0 On
}
//------------------------------------------------

void delay2(int mul)
{
while(dly_stone< (500*mul));
}

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

void delay1(int mul)
{int i,j;
for(i=0; i< mul*1000;i++)
 for(j=0;j < mul*1000;j++);
}
//-----------------------------------------------------------------------------

void timer0 (void) interrupt 1 using 2 
{
TL0=0xFF;
TH0=0xDB;
++dly_stone;
}
//-----------------------------------------------

int GetInputDesimal(void)
{
unsigned char bcd_data, bin_data;
bcd_data = P1;

return bin_data;
}
//-----------------------------------------------
void main(void)
{unsigned char data1;
InitTimer0();
IE = 0x82;
data1 = 0x03;
for(;;)
 {
 P0 = data1;
 delay1(1);
 if ((P1 & 0x01) == 0x01)data1= data1 << 1;
 else data1= data1 >> 1;
 if (CY == 1) data1 |= 0x01;
 delay2(1);
 }
}

//-------------------------- end file of Praktek7.c -----------------------