Common anode 8-segment digital tube display circuit diagram

Dynamic scanning display: The figure below shows the dynamic scanning circuit diagram of 6 common anode LEDs. In the picture, the B port of 8155 is connected to all dp(sp), g, f, e, d, c, b, a leads. Each LED control terminal G (i.e. 0, 1 inside each digital tube shown in the picture) , 2, 3, 4, 5) are connected to the C port of the 8155, so the B port is a font port and the C port is a font port, because the CPU can control whether each LED is lit through the C port.