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| 型號(hào)： | EFM32-TG840F32-SK |
| 廠商： | Energy Micro |
| 文件頁(yè)數(shù)： | 17/136頁(yè) |
| 文件大小： | 0K |
| 描述： | IC MICRO KIT GECKO 64QFN |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | Tiny Gecko |
| 套件類型： | 微控制器 |
| 值： | 2 件 - 閃存 - 32KB |
| 包裝： | 紙板盒 |
| 安裝類型： | 表面貼裝 |
| 包括封裝： | 64-QFN |
| 工具箱內(nèi)容： | (2) 914-1036-2-ND - MCU 32BIT 32KB FLASH 64-QFN |
| 其它名稱： | 914-1020 |
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...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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| EFM32TG840F32-T | 制造商:Energy Micro AS 功能描述:IC MCU 32BIT 32KB FLASH 64QFN |
| EFM32TG840F8 | 功能描述:ARM微控制器 - MCU 8KB Flash 2KB RAM RoHS:否 制造商:STMicroelectronics 核心:ARM Cortex M4F 處理器系列:STM32F373xx 數(shù)據(jù)總線寬度:32 bit 最大時(shí)鐘頻率:72 MHz 程序存儲(chǔ)器大小:256 KB 數(shù)據(jù) RAM 大小:32 KB 片上 ADC:Yes 工作電源電壓:1.65 V to 3.6 V, 2 V to 3.6 V, 2.2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:LQFP-48 安裝風(fēng)格:SMD/SMT |
| EFM32TG840F8-QFN64 | 制造商:Energy Micro AS 功能描述:8 FLASH, USART + UART 2, QFN64 - Tape and Reel 制造商:Energy Micro AS 功能描述:IC MCU 32BIT 8KB FLASH 64QFN |
| EFM32TG840F8-QFN64T | 制造商:Energy Micro AS 功能描述:32 BIT ARM MPU, TINY GECKO - Trays |
| EFM32TG840F8-QFN64-T | 制造商:Energy Micro AS 功能描述:IC MCU 32BIT 8KB FLASH 64QFN |
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