更快的MCU内存的考虑

　　更快的MCU内存的考虑

　　闪存的微控制器（MCU）现在完全占主导地位，但记忆考虑为处理器变得更加复杂，有先进的32位架构和外设更可。这是很容易忘记的记忆，使MCU的片上外设更多异国之间（SOC）包括先进的电机控制、图形用户界面（GUI），和网络。

　　不过，Flash和其他内存类型的细节值得注意，以确保所选MCU具有与系统需求相匹配的内存。迅速增加的手臂®皮质™M处理器架构在MCUs更高的速度，也请仔细检查内存支持。供应商对他们的片上存储器选项采取不同的方法，这可能会降低MCU的选择平衡。

　　正如一个兆字节的Flash存储器可在较大的MCU的今天。程序商店，比数据表，并暂存RAM改为MCU发现了新的功能和新的应用。高端MCU可能是编程的高级语言（HLL），运行实时操作系统（RTOS），利用现成的栈和软件包。这些因素都影响记忆需要和使用。

　　The Flash memory typically used on MCUs has access times that let it keep up with 25 to 50 MHz processor clocks. When high performance processor cores are clocked over 200 MHz， there could be a huge gap to fill with time- and power-consuming wait-states. Multiple on-chip buses and special routing mechanisms can be quite beneficial in alleviating the traffic problems in some busy microcontrollers.

　　The ARM processor core architecture has very good code density due to its compact Thumb2® instructions which require only 16 bits to store instructions rather than the expected 32 bits. The ARM Cortex-M0， Cortex-M3， and Cortex-M4 cores are popular in microcontrollers from numerous vendors， and some memory choices will be investigated here.