參數(shù)資料
型號： EFM32G842F128
廠商： Energy Micro
文件頁數(shù)： 17/136頁
文件大?。?/td> 0K
描述： IC MCU 32BIT 128KB FLASH 64LQFP
標準包裝： 1
系列： Gecko
核心處理器： ARM? Cortex?-M3
芯體尺寸： 32-位
速度： 32MHz
連通性： I²C，IrDA，智能卡，SPI，UART/USART
外圍設備： 欠壓檢測/復位，DMA，LCD，POR，PWM，WDT
輸入/輸出數(shù)： 53
程序存儲器容量： 128KB（128K x 8）
程序存儲器類型： 閃存
RAM 容量： 16K x 8
電壓 - 電源 (Vcc/Vdd)： 1.8 V ~ 3.8 V
數(shù)據(jù)轉換器： A/D 8x12b，D/A 2x12b
振蕩器型： 外部
工作溫度： -40°C ~ 85°C
封裝/外殼： 64-TQFP
包裝： 標準包裝
其它名稱： 914-1028-6
...the world's most energy friendly microcontrollers
2011-02-04 - d0002_Rev1.00
113
www.energymicro.com
4.4.4 SysTick Calibration Value Register
The CALIB register indicates the SysTick calibration properties and is a read only register. See the
register summary in Table 4.32 (p. 111) for its attributes. The bit assignments are:
31
0
TENMS
Reserved
23
24
30
SKEW
NOREF
29
Table 4.36. CALIB register bit assignments
Bits
Name
Function
[31]
NOREF
Reads as zero. Indicates that a the RTC counter bit 0 is provided as a reference clock.
[30]
SKEW
Reads as one. Calibration value for the 10ms inexact timing is not known because TENMS is not
known . This can affect the suitability of SysTick as a software real time clock.
[29:24]
-
Reserved.
[23:0]
TENMS
Read as 0x0036B0, which gives 10 ms ticks when running off a 14 MHz clock.
If calibration information is not known, calculate the calibration value required from the frequency of the
processor clock or external clock.
4.4.5 SysTick design hints and tips
The SysTick counter runs on the processor clock or bit 0 of the RTC counter value. If the clock signal in
use is stopped (e.g. in lower Energy Modes), the SysTick counter stops.
Ensure software uses aligned word accesses to access the SysTick registers.
4.5 Memory protection unit
This section describes the Memory protection unit (MPU).
The MPU divides the memory map into a number of regions, and defines the location, size, access
permissions, and memory attributes of each region. It supports:
independent attribute settings for each region
overlapping regions
export of memory attributes to the system.
The memory attributes affect the behavior of memory accesses to the region. The Cortex-M3 MPU
defines:
eight separate memory regions, 0-7
a background region.
When memory regions overlap, a memory access is affected by the attributes of the region with the
highest number. For example, the attributes for region 7 take precedence over the attributes of any
region that overlaps region 7.
The background region has the same memory access attributes as the default memory map, but is
accessible from privileged software only.
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相關代理商/技術參數(shù)
參數(shù)描述
EFM32G842F128G-E-QFP64 功能描述:128K FLASH, 16K RAM, 4X22 LCD, A 制造商:silicon labs 系列:Gecko 包裝:托盤 零件狀態(tài):在售 核心處理器:ARM? Cortex?-M3 核心尺寸:32-位 速度:32MHz 連接性:I2C，IrDA，智能卡，SPI，UART/USART 外設:欠壓檢測/復位，DMA，LCD，POR，PWM，WDT I/O 數(shù):53 程序存儲容量:128KB（128K x 8） 程序存儲器類型:閃存 EEPROM 容量:- RAM 容量:16K x 8 電壓 - 電源（Vcc/Vdd）:1.98 V ~ 3.8 V 數(shù)據(jù)轉換器:A/D 8x12b，D/A 2x12b 振蕩器類型:內部 工作溫度:-40°C ~ 85°C（TA） 封裝/外殼:64-TQFP 供應商器件封裝:64-TQFP（10x10） 標準包裝: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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