pdf-to-md-test/1.3_Cortex-M4_processor_p13.md

来源：PM0214 Rev 10，Page 13

1.3 About the STM32 Cortex-M4 processor and core peripherals

The Cortex-M4 processor is a high performance 32-bit processor designed for the microcontroller market. It offers significant benefits to developers, including:

• Outstanding processing performance combined with fast interrupt handling
• Enhanced system debug with extensive breakpoint and trace capabilities
• Efficient processor core, system and memories
• Ultra-low power consumption with integrated sleep modes
• Platform security robustness, with integrated memory protection unit (MPU)

The Cortex-M4 processor is built on a high-performance processor core, with a 3-stage pipeline Harvard architecture, making it ideal for demanding embedded applications. The processor delivers exceptional power efficiency through an efficient instruction set and extensively optimized design, providing high-end processing hardware including:

• IEEE754-compliant single-precision floating-point computation
• A range of single-cycle and SIMD multiplication and multiply-with-accumulate capabilities
• Saturating arithmetic
• Dedicated hardware division

Figure 1. STM32 Cortex-M4 implementation

架构框图展示了 Cortex-M4 处理器的内部结构，包含以下主要组件：

组件	说明
Cortex-M4 processor	处理器核心
FPU	浮点运算单元
NVIC	嵌套向量中断控制器
Memory protection unit	内存保护单元
Debug access port	调试访问端口
Embedded Trace Macrocell	嵌入式跟踪宏单元
Serial wire viewer	串行线查看器
Bus matrix	总线矩阵
Flash patch	Flash补丁
Data watchpoints	数据监视点
Code interface	代码接口
SRAM and peripheral interface	SRAM和外设接口

寄存器位访问类型

缩写	含义
read/clear (rc_w1)	Software can read as well as clear this bit by writing 1. Writing '0' has no effect on the bit value.
read/clear (rc_w0)	Software can read as well as clear this bit by writing 0. Writing '1' has no effect on the bit value.
toggle (t)	Software can only toggle this bit by writing '1'. Writing '0' has no effect.
Reserved (Res.)	Reserved bit, must be kept at reset value.

原始图片：imgs/page_13.png（无图则注明无图）