Using a single-chip microcomputer to control the display of 6 common cathode 8-segment digital tubes, two latches can be used to select the position (which digital tube is the position) and the segment (which segment of the digital tube is the number to be displayed). The enable end of the 74HC573 latch is valid at a low level. When LE is high, the output end (output) follows the input end (D); when LE is low, the output end maintains the value when LE is high. The circuit diagram of the single-chip microcomputer controlling the digital tube through the latch is shown in Figure 1:
0x3f , 0x06 , 0x5b , 0x4f , 0x66 , 0x6d ,
0 1 2 3 4 5
0x7d , 0x07 , 0x7f , 0x6f , 0x77 , 0x7c ,
6 7 8 9 A B
0x39 , 0x5e , 0x79 , 0x71 , 0x00
C D E F No display
Reference address：Single chip microcomputer controls digital tube display
illustrate:
1) When the digital tube is a common cathode, when the bit selects Q0~Q5, the response bit is 0 for selected, and 1 for unselected. For example, if the first digital tube P0 is selected = 0xfe;
2) Common cathode digital tube meter (segment selection meter)
0x3f , 0x06 , 0x5b , 0x4f , 0x66 , 0x6d ,
0 1 2 3 4 5
0x7d , 0x07 , 0x7f , 0x6f , 0x77 , 0x7c ,
6 7 8 9 A B
0x39 , 0x5e , 0x79 , 0x71 , 0x00
C D E F No display
3) Common cathode position selection table
0xfe,0xfd,0xfb,0xf7,0xef,0xdf
1 2 3 4 5 6 (Choose which one)
3) Generally, the bit selection is performed first, then the lock is stored, and then the segment selection is performed, and the program example is
sbit dula=P2^7;
sbit wela=P^8;
while(1)
{
wela=1;//bit selection
P0=0xfe; //Select the second digital tube
wela=0; //bit latch
dula=1;//segment selection
P0=0x39; //display 6
dula=0; //segment latch
delay (); //Usually write a delay function yourself or use an interrupt timer to delay
}
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