开发环境：unSP IDE 2.0.0

实验目的:

1)了解IRQ4的中断向量和中断源。

2)掌握中断控制单元P_INT_Ctrl, P_INT_Clear的设置方法。

3)熟悉中断的编程方法。

实验设备:

1)装有µ ’nSP™ IDE仿真环境的PC机一台。 2)µ ’nSP™ 十六位单片机实验箱一个。

实验原理: IRQ4 中断对应4096Hz、2048Hz、1024Hz 中断源,通过写P_INT_Ctrl来设置中断允许，CPU响应后进入中断， 我们编写一个用中断方式控制发光二极管亮灭程序, 中断程序里读取P_INT_Ctrl单元,判断是哪个中断源，转到相应中断程序控制对应发光二极管亮或灭.从而了解IRQ4 中断的组成及编程。

实验步骤:

1）根据实验内容自行设计，连接硬件电路并检查。

2）画流程图并编写程序代码。

3）编译程序，软件调试。

4) 观察LED、各个寄存器状态等。

要求: 能用LED的状态验证中断正确工作。

(综合要求：可用按键控制各个中断原是否产生中断。)-The experiment:

1) Learn IRQ4 interrupt vector and interrupt sources.

2) master interrupt control unit P_INT_Ctrl, P_INT_Clear setting method.

3) Familiar interrupt programming methods.

Laboratory equipment:

1) with μ nSP ™　IDE emulation environment for PC machine. 2) μ nSP ™　16 single-chip experiment box one.

Experimental principle: IRQ4 interrupt corresponding 4096Hz, 2048Hz, 1024Hz interrupt source by writing P_INT_Ctrl to set the interrupt enable, CPU respond after entering the interrupt, we write an interrupt control with LED lights off procedures, the interrupt routine reads P_INT_Ctrl unit to determine which interrupt source, go to the corresponding interrupt program controls the corresponding LEDs on or off. IRQ4 interrupt to understand the composition and programming.

Experimental procedure:

1) According to the experimental design their own content, connecting hardware circuit and check.

2) draw flowcharts and write program code.

3) compiler, software deb