How Is The Digital Tube Used in The Single-chip Microcomputer Circuit?

The digital tube is often used in the single-chip microcomputer circuit. How to use it in the application? The digital tube has two common anode tubes and common cathode tubes. The segment codes from high to low are h(dp), g, f ,e,d,c,b,a has eight digits. The common cathode tube is "1" means bright, "0" means off, and the common anode tube is the opposite. By the way, if you want to test whether the digital tube is in good condition, you can use the digital tube "8" to test.

If you want to display 0~F on the nixie tube, you can use a fixed set of hexadecimal numbers, which can be placed in an array as {0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f ,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71}. This array is used to indicate the brightness of the common cathode tube, and if it is a common anode tube, you need to add "~" in front.

According to the working mode, the digital tube driver can be divided into static display and dynamic scanning. Dynamic scanning is to connect all the same segments of A-dp in the 8 segment codes of all displays together and connect them to a common output port, while the bit ends of the digital tubes are respectively connected to other output ports. The two sets of signals at the output port interact to produce a display effect. That is to let each digital tube display in turn according to a certain order, as long as the scanning frequency is high enough, due to the phenomenon of "visual persistence" of the human eye, it can display continuously and stably. The advantages of the static display method are that the display is stable, the brightness is high, and the CPU time is saved, but it occupies more I/O ports and the hardware cost is high. The characteristic of dynamic scanning is that it can significantly reduce the cost of the display part and greatly reduce the connection structure of the display interface. For example, to statically drive a 4-bit digital tube, 4×8=32 I/O ports are needed, while a dynamic drive-bit digital tube only needs 4+8=12 I/O ports.

The independent common anode tube displays 0-F, and the 8-bit common cathode tube displays two ways: static scanning and dynamic scanning.

8 simultaneous 0-F static scans.

Display 0-F: first display 0-7, then display 8-F Bit: 1-8, 1-8 Dynamic scan.