Example:

Provide a reference sample to the user, as shown below, posed for a

AT89S51 circuit LED experiment, the Port 1 in the AT89S51 eight external

LED, another-J1 connector, the pins are defined as Vcc, RST, SCK, MOSI,

MISO, GND.

A special attention, J1 connector pin is how to connect to AT89S51 the pin:

RST (Pin 9), MOSI (Pin 6), MISO (Pin 7), SCK (Pin 8).

USB multi-Programmer is the use of In-System Programmable (ISP) model

to programming memory, you must use the MOSI, MISO, SCK, RST, J1

connector is to be connected to a USB multi-programmer supply 5V power.

When programming is complete, perform AT89S51, these three pins can be as

general I / O Pin, absolutely no impact. When the LED test program execution,

Port 1 of the LED will follow the program set by the order of ON / OFF.

AT89S51 LED test circuit:

LED Test Program：

#include <AT89X52.H>
void delay_time(unsigned int k);
//---------------------------------------------------------------
// Main Program
//--------------------------------------------------------------
void main (void)
{
unsigned char i=0x01;

while (1)

{

P1=i; // Port 1 output

delay_time(50000); // delay time
i=i<<1;
if (i==0)
i=0x01;
}
}
//--------------------------------------------------------------
// delay time routine
//--------------------------------------------------------------
void delay_time(unsigned int k)
{
while(k>0)
k--;
}