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 Programÿ
#include
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--;
}