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参数资料
型号： EFM32TG222F32
厂商： Energy Micro
文件页数： 16/136页
文件大小： 0K
描述： IC MCU 32BIT 32KB FLASH 48LQFP
特色产品： EFM32 Tiny Gecko
标准包装： 1
系列： Tiny 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，I²S，POR，PWM，WDT
输入/输出数： 37
程序存储器容量： 32KB（32K x 8）
程序存储器类型： 闪存
RAM 容量： 4K x 8
电压 - 电源 (Vcc/Vdd)： 1.8 V ~ 3.8 V
数据转换器： A/D 4x12b，D/A 1x12b
振荡器型： 外部
工作温度： -40°C ~ 85°C
封装/外壳： 48-TQFP
包装： 标准包装
其它名称： 914-1029-6
...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
Section 4.4.2.1 (p. 112) .
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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