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参数资料
型号： EFM32G842F128
厂商： Energy Micro
文件页数： 93/136页
文件大小： 0K
描述： IC MCU 32BIT 128KB FLASH 64LQFP
标准包装： 1
系列： Gecko
核心处理器： ARM? Cortex?-M3
芯体尺寸： 32-位
速度： 32MHz
连通性： I²C，IrDA，智能卡，SPI，UART/USART
外围设备： 欠压检测/复位，DMA，LCD，POR，PWM，WDT
输入/输出数： 53
程序存储器容量： 128KB（128K x 8）
程序存储器类型： 闪存
RAM 容量： 16K x 8
电压 - 电源 (Vcc/Vdd)： 1.8 V ~ 3.8 V
数据转换器： A/D 8x12b，D/A 2x12b
振荡器型： 外部
工作温度： -40°C ~ 85°C
封装/外壳： 64-TQFP
包装： 标准包装
其它名称： 914-1028-6
...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
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相关代理商/技术参数
参数描述
EFM32G842F128G-E-QFP64 功能描述:128K FLASH, 16K RAM, 4X22 LCD, A 制造商:silicon labs 系列:Gecko 包装:托盘 零件状态:在售 核心处理器:ARM? Cortex?-M3 核心尺寸:32-位 速度:32MHz 连接性:I2C，IrDA，智能卡，SPI，UART/USART 外设:欠压检测/复位，DMA，LCD，POR，PWM，WDT I/O 数:53 程序存储容量:128KB（128K x 8） 程序存储器类型:闪存 EEPROM 容量:- RAM 容量:16K x 8 电压 - 电源（Vcc/Vdd）:1.98 V ~ 3.8 V 数据转换器:A/D 8x12b，D/A 2x12b 振荡器类型:内部 工作温度:-40°C ~ 85°C（TA） 封装/外壳:64-TQFP 供应商器件封装:64-TQFP（10x10） 标准包装:160
EFM32G842F128-QFP64 制造商:Energy Micro AS 功能描述:GECKO MCU - Tape and Reel 制造商:Energy Micro AS 功能描述:IC MCU 32BIT 128KB FLASH 64TQFP
EFM32G842F128-QFP64T 制造商:Energy Micro AS 功能描述:32 BIT ARM MPU, GECKO - Trays
EFM32G842F128-QFP64-T 制造商:Energy Micro AS 功能描述:IC MCU 32BIT 128KB FLASH 64TQFP
EFM32G842F128-T 制造商:Energy Micro AS 功能描述:IC MCU 32BIT 128KB FLASH 64TQFP
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