数字信号控制器的中断系统分析与实现方法

数字信号控制器(DSC)具有数字信号处理能力和MCU控制接口,其中断系统功能非常丰富,这为应用带来方便,同时也带来设置的复杂性。本文以MC56F8257为例,详细分析DSC中断系统及其设置方法;以MC56F8257中的QSCI模块中断及CAN模块中断为例,从不带中断优先级、带中断优先级和优先级嵌套三个方面,分析DSC中断设置过程及响应结果。分析结果进一步验证DSC中断具有优先级及屏蔽等特点,为推广DSC芯片的应用提供指导。

Analysis and Implementation of Interrupt System in Digital Signal Controller

Digital Signal Controller （DSC） has the ability of digital signal processing and MCU control interface. The interrupt system has many functions, which brings more conveniences for applications and the complexity of settings. Taking MC56F8257 as an example, this paper analyzes interrupt system of DSC and its setting methods in detail. Taking the QSCI module interrupt and CAN module interrupt of MC56F8257 as an example, the interrupt setting process and its responding results of DSC are analyzed from three aspects including without interrupt priority, with interrupt priority and interrupt nesting. The results prove that the DSC interrupt has priority and mask characteristics, which provides guidance to promote the use of DSC chips.