资 源 简 介
使用您的MCU的内存架构，提高应用效率
现代微控制器具有多种记忆元素，并了解他们的组织、性能的限制和功率的影响可能是实现一个高效应用的关键。特别是，用于代码存储的片上闪存的特性，用于数据存储的片上SRAM的组织和片外存储器的访问特性将有显着影响整体处理效率。让我们检查这些关键的内存元素，以更好地了解如何最有效地使用它们，以最大限度地提高性能，降低功耗和优化系统成本。
片上闪存
片上闪存可能是任何应用程序中最关键的存储元件，因为它通常是处理器的所有指令的来源。如果指令不能有效地获取，则您的整体MCU性能将受到影响。向CPU传递指令有两种不同的方法。在一种方法中，内存运行速度快，需要匹配的指令周期的CPU。瑞萨RX600组，例如，采用先进的Flash技术，提供高性能的零等待状态访问指令存储器。这种方法导致简化的CPU架构和确定的时序。
Access to Flash memory typically uses a two-port approach with CPU access， via a high-speed bus for read operaTIons and slower access， using a Flash memory controller for write operaTIons. The Flash memory interface for the RX600 is illustrated in Figure 1. Note that the Flash memory is further segmented into a data Flash secTIon， for storing non-volaTIle information that is frequently modified， and the instruction section， which is typically considered as Read-Only Memory （ROM）， even though it uses Flash technology and can be reprogrammed many times by the user during manufacturing or via system updates. The Flash Control Unit （FCU） is a standalone specialized processor that managed Flash writes and has its own RAM and firmware memory blocks. The CPU can initiate FCU operations; this is accomplished using the peripheral bus shown at the top of Figure 1.
