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1、8255 芯片初始化 (1) 分析原理图,计算 8255 芯片和 8253 芯片在 IO 空间中各内部寄存器的端口地址,修改 Demo 程序(main.asm 和 INTDemo.asm)中 IO 空间地址的符号定义(xxH)。 (2) 分析原理图中 8255 芯片 PA、PB 和 PC 口的信号传输方向确定各端口的输入及输出状 态,填充源代码框架中 8255 芯片初始化子程序 INIT8255,完成 8255 芯片初始化代码。 (3) 分析原理图中 PC 口的电路功能,完成对 PC 口各信号线的控制。填充源代码框架中 AccessPC 子程序,实现对 PC 口 PC0 的开关信号量查询,并将其值输出到 PC 口的 PC6 引脚,C 口其他引脚的值不可改变(注 2)。 (4) 填充源代码框架中 DISPLAY8255 子程序,将 PC6 引脚的状态(0 或 1)显示在第 1 个 数码管上。(1. Learn how to use the programmable timer/counter interface chip 8253 to master the basic components and functions of the 8253, the control word format, the address assignment of each register, and the characteristics of the six operating modes (especially mode 0), 2 and 3). Description. 2. Understand the basic concepts of interrupts, the handling of interrupts, and the priority management of interrupts. Master the 8086 system interrupt instructions, interrupt classification, interrupt vector table, interrupt entry address, interrupt handler and interrupt service routine. Proficiency in writing the 8086 interrupt service routine to understand the difference between ISR writes and general subroutine writes)
Date : 2026-01-22 Size : 1.28mb User : manstein09
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