#include <reg52.h> /* special function register declarations */
#include <stdio.h> /* prototype declarations for I/O functions */

//Define Bit
sbit SDA = P1^0;
sbit RST = P1^1;
sbit SCL = P1^2;

// Function
void init (void)
{
SCON = 0x52;
TMOD = 0x20;
TH1 = 0xfd;
TR1 = 1;
}

void delay (void) /*Delay smartcard*/
{
unsigned char i;
i = 20;
while (i>0) i--;
}

//RESET
void card_reset (void) /*Reset Smart Card*/
{
RST = 1;
delay();
SCL = 1;
delay();
SCL = 0;
delay();
RST = 0;
delay();

}
//Read 1 Byte
unsigned char rd_byte (void)
{
unsigned char i,dat;
bit inport;
dat = 0;
for (i=1;i<=8;i++)
{
SDA = 1;
dat >>= 1;
delay();
if (SDA) dat |= 0x80; else dat &= 0x7f;
SCL = 1;
delay ();
SCL = 0;
delay ();
}
return(dat);
}

/****************MAIN*******************/
void main (void)
{ unsigned char j;
init();

printf("\nRead TOT Card SLE4436\n");
card_reset();
for (j=1;j<=6;j++) /*Read 6x8 = 48 Byte*/
{unsigned char k;
for (k=1;k<=8;k++)
{
printf("%b02X ",rd_byte()); /*Show Data*/
}
printf("\n");
}
while(1);
}