In the 8051 single-chip microcomputer application system, the serial interface can be used to expand the parallel I/O port (assuming that the serial port works in the shift register, mode 0 state). The serial shift output connected to the output shift register 74LS164 can expand an 8-bit parallel output port to connect an LED digital tube for static display.
As shown in the figure. There are 6 common anode LED digital tubes, programmed to display 200304.
C51 software design:
# include //preprocessing
# include
unsigned char code ledcode[11]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88}; //font encoding
unsigned char code buf[6]={0x2,0x00,0x00,0x03,0x00,0x04}; //200304
void main(void) //main function
{
unsigned char idata i,k;
SCON=0x00; //serial port initialization
ES=0;
EA=0; //disable interrupt
for(i=0;i<6;i++)
{
TI=0;
k=buf[i];
k=ledcode[k];
SBUF=k;
while(TI==0);
}
while(1);
}
Reference address：8051 MCU serial port expansion LED display interface and application
As shown in the figure. There are 6 common anode LED digital tubes, programmed to display 200304.
C51 software design:
# include
# include
unsigned char code ledcode[11]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88}; //font encoding
unsigned char code buf[6]={0x2,0x00,0x00,0x03,0x00,0x04}; //200304
void main(void) //main function
{
unsigned char idata i,k;
SCON=0x00; //serial port initialization
ES=0;
EA=0; //disable interrupt
for(i=0;i<6;i++)
{
TI=0;
k=buf[i];
k=ledcode[k];
SBUF=k;
while(TI==0);
}
while(1);
}
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