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參數資料
型號: EFM32-TG108F32-SK
廠商: Energy Micro
文件頁數: 16/136頁
文件大小: 0K
描述: IC MICRO KIT GECKO 24QFN
標準包裝: 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: 24-QFN
工具箱內容: (2) 914-1032-2-ND - MCU 32BIT 32KB FLASH 24-QFN
其它名稱: 914-1025
...the world's most energy friendly microcontrollers
2011-02-04 - d0002_Rev1.00
112
www.energymicro.com
Bits
Name
Function
[0]
ENABLE
Enables the counter:
0 = counter disabled
1 = counter enabled.
When ENABLE is set to 1, the counter loads the RELOAD value from the LOAD register and then counts
down. On reaching 0, it sets the COUNTFLAG to 1 and optionally asserts the SysTick depending on the
value of TICKINT. It then loads the RELOAD value again, and begins counting.
4.4.2 SysTick Reload Value Register
The LOAD register specifies the start value to load into the VAL register. See the register summary in
Table 4.32 (p. 111) for its attributes. The bit assignments are:
31
0
RELOAD
Reserved
23
24
Table 4.34. LOAD register bit assignments
Bits
Name
Function
[31:24]
-
Reserved.
[23:0]
RELOAD
Value to load into the VAL register when the counter is enabled and when it reaches 0, see
4.4.2.1 Calculating the RELOAD value
The RELOAD value can be any value in the range 0x00000001-0x00FFFFFF. A start value of 0 is
possible, but has no effect because the SysTick exception request and COUNTFLAG are activated when
counting from 1 to 0.
The RELOAD value is calculated according to its use:
To generate a multi-shot timer with a period of N processor clock cycles, use a RELOAD value of N-1.
For example, if the SysTick interrupt is required every 100 clock pulses, set RELOAD to 99.
To deliver a single SysTick interrupt after a delay of N processor clock cycles, use a RELOAD of value
N. For example, if a SysTick interrupt is required after 400 clock pulses, set RELOAD to 400.
4.4.3 SysTick Current Value Register
The VAL register contains the current value of the SysTick counter. See the register summary in
Table 4.32 (p. 111) for its attributes. The bit assignments are:
31
0
CURRENT
Reserved
23
24
Table 4.35. VAL register bit assignments
Bits
Name
Function
[31:24]
-
Reserved.
[23:0]
CURRENT
Reads return the current value of the SysTick counter.
A write of any value clears the field to 0, and also clears the SysTick CTRL.COUNTFLAG bit to 0.
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相關代理商/技術參數
參數描述
EFM32TG108F32-T 制造商:Energy Micro AS 功能描述:IC MCU 32BIT 32KB FLASH 24QFN
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