0 basic learning C language - nixie tube dynamic scanning display

One 、 The concept of dynamic scanning

The persistence of light-emitting diodes in human vision , Although in fact, the digital tubes are not lit at the same time , But as long as the scan is fast enough , A stable set of data gives the impression that , There's no flicker , The effect of dynamic display is the same as that of static display , Can save a lot of I/O port , And lower power consumption .

Two 、 Example is given to illustrate

1、 Schematic diagram

2、 Practice examples

1. example 1— Display fixed values

1. Display subroutine
2. Delay subroutine
   
3. The main program

2. example 2— Display the value of runout

1. Initialization subroutine , Every time the overflow interrupt is completed, it must be given again TH0 Follow TL0 An initial value
   
2. Timer interrupt subroutine —— Every overflow interrupt tt+1.
   
3. Display subroutine , Pay attention to the need for shadow elimination
   
4. The main program , interrupt 1 Next is 50ms, Cumulative 20 The first interrupt is 1 second , Namely variable tt=20 by 1 second . The variable temp+1 And displayed on the nixie tube （ Specify maximum to 100）