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参数资料
| 型号： | EFM32-TG108F32-SK |
| 厂商： | Energy Micro |
| 文件页数： | 93/136页 |
| 文件大小： | 0K |
| 描述： | IC MICRO KIT GECKO 24QFN |
| 标准包装： | 1 |
| 系列： | Tiny Gecko |
| 套件类型： | 微控制器 |
| 值： | 2 件 - 闪存 - 32KB |
| 包装： | 纸板盒 |
| 安装类型： | 表面贴装 |
| 包括封装： | 24-QFN |
| 工具箱内容： | (2) 914-1032-2-ND - MCU 32BIT 32KB FLASH 24-QFN |
| 其它名称： | 914-1025 |
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...the world's most energy friendly microcontrollers
2011-02-04 - d0002_Rev1.00
6
www.energymicro.com
2 The Cortex-M3 Processor
2.1 Programmers model
This section describes the Cortex-M3 programmers model. In addition to the individual core register
descriptions, it contains information about the processor modes and privilege levels for software
execution and stacks.
2.1.1 Processor mode and privilege levels for software execution
The processor modes are:
Thread mode
Used to execute application software. The processor enters Thread mode when it
comes out of reset.
Handler mode
Used to handle exceptions. The processor returns to Thread mode when it has
finished exception processing.
The privilege levels for software execution are:
Unprivileged
The software:
has limited access to the MSR and MRS instructions, and cannot use the CPS
instruction
cannot access the system timer, NVIC, or system control block
might have restricted access to memory or peripherals.
Unprivileged software executes at the unprivileged level.
Privileged
The software can use all the instructions and has access to all resources.
Privileged software executes at the privileged level.
In Thread mode, the CONTROL register controls whether software execution is privileged or
unprivileged, see Section 2.1.3.7 (p. 12) . In Handler mode, software execution is always privileged.
Only privileged software can write to the CONTROL register to change the privilege level for software
execution in Thread mode. Unprivileged software can use the SVC instruction to make a supervisor call
to transfer control to privileged software.
2.1.2 Stacks
The processor uses a full descending stack. This means the stack pointer indicates the last stacked item
on the stack memory. When the processor pushes a new item onto the stack, it decrements the stack
pointer and then writes the item to the new memory location. The processor implements two stacks, the
main stack and the process stack, with independent copies of the stack pointer, see Section 2.1.3.2 (p.
8) .
In Thread mode, the CONTROL register controls whether the processor uses the main stack or the
process stack, see Section 2.1.3.7 (p. 12) . In Handler mode, the processor always uses the main
stack. The options for processor operations are:
Table 2.1. Summary of processor mode, execution privilege level, and stack use options
Processor
mode
Used to execute
Privilege level for software
execution
Stack used
Thread
Applications
Privileged or unprivileged
1
Main stack or process stack
1
相关PDF资料 |
PDF描述 |
|---|---|
| FAM1-400-400-1.5-1A | FAM1 SHEET 400X400X1.5MM W/ADH |
| EFM32-G890F128-SK | IC MICRO KIT GECKO 112BGA |
| 176C | TRANSFORMER AUTO STEP UP/PLG IN |
| EFM32-G880F128-SK | IC MICRO KIT GECKO 100LQFP |
| FAM1-400-400-1.0-1A | FAM1 SHEET 400X400X1MM W/ADH |
相关代理商/技术参数 |
参数描述 |
|---|---|
| EFM32TG108F32-T | 制造商:Energy Micro AS 功能描述:IC MCU 32BIT 32KB FLASH 24QFN |
| EFM32TG108F4 | 功能描述:ARM微控制器 - MCU 4KB Flash 1KB RAM RoHS:否 制造商:STMicroelectronics 核心:ARM Cortex M4F 处理器系列:STM32F373xx 数据总线宽度:32 bit 最大时钟频率:72 MHz 程序存储器大小:256 KB 数据 RAM 大小:32 KB 片上 ADC:Yes 工作电源电压:1.65 V to 3.6 V, 2 V to 3.6 V, 2.2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:LQFP-48 安装风格:SMD/SMT |
| EFM32TG108F4-QFN24 | 制造商:Energy Micro AS 功能描述:TINY GECKO MCU - Tape and Reel 制造商:Energy Micro AS 功能描述:IC MCU 32BIT 4KB FLASH 24QFN |
| EFM32TG108F4-QFN24T | 制造商:Energy Micro AS 功能描述:32 BIT ARM MPU, TINY GECKO - Trays |
| EFM32TG108F4-QFN24-T | 制造商:Energy Micro AS 功能描述:IC MCU 32BIT 4KB FLASH 24QFN |
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