前言发展新型的电子产品要有合适的设计工具,比如在以往的电子产品设计中使用示波器、电压表、频率计、逻辑分析仪等等。然而,在以微处理机为基础的产品设计中,情况发生了很大的变化。从前靠互连逻辑门来设计的产品现在要使用大规模集成数字电路模块来实现。这类电路模块往往是通用的,其功能常由编制的程序来决定。因为芯片集成度高了,引线变少了,很多操作是在芯片内部完成的,所 Preface The development of new electronic products should have appropriate design tools, such as the use of oscilloscopes, voltmeters, frequency counters, logic analyzers, etc. in previous electronic product designs. However, the situation has changed dramatically in microprocessor-based product design. Products previously designed with interconnected logic gates are now implemented using large scale integrated digital circuit blocks. This type of circuit module is often universal, its function is often determined by the preparation of the program. Because of the high level of chip integration, fewer leads and many operations are done inside the chip,