"数据采集系统与波形发生器的微机与单片机设计实验"

The course design of microcomputer and single-chip microcomputer focuses on the comprehensive design of a data acquisition system and a simple waveform generator. The design task includes generating 1-second timing pulses using the 8253 timer/counter and using it as the interrupt request signal for the 8259 interrupt controller. The CPU responds to the interrupt request by initiating A/D conversion on the analog voltage input from a potentiometer using the ADC0809. The converted result is then displayed on a 8279 as a two-digit hexadecimal number and simultaneously displayed on an 8-bit LED display through the PB port of the 8255 parallel interface. The final result of the design is that when the potentiometer knob is adjusted, the LED display and 8-bit LED display will show the corresponding digital quantity value of the analog input voltage. The assembly program includes a predefined section with segment definitions for LED data and segment codes. The LED data segment includes data for displaying numbers on a common cathode seven-segment display. The code segment includes the program flowchart and assembly code for the design. Overall, the design project demonstrates the integration of hardware components and programming techniques for data acquisition and display using a microcomputer and single-chip microcontroller. The project achieves the goal of accurately converting analog signals to digital values and displaying them in a user-friendly manner, showcasing the fundamentals of embedded system design and implementation.