6.9. Project 8 – Four-Digit Multiplexed Seven-Segment LED Counter With- h Timer Interrupt
6.9.1. Project Description
This project is similar to Project 7, but a 4-digit display is used instead of a 2-digit display. Thus, any integer in the range from 0 to 9999 can be displayed. As in Project 7, the display is updated in the ISR; consequently, the processor can perform other tasks while the display is updated in the background. In this project, the value of a counter is displayed as it counts up every second. The operation of this project is very similar to that of Project 7; therefore, the project is not described again here in detail.
6.9.2. Project Hardware
The circuit diagram of this project is shown in Figure 6.42, where four 7-segment ...