參數(shù)資料
型號： EFM32TG110F32
廠商： Energy Micro
文件頁數(shù)： 15/136頁
文件大?。?/td> 0K
描述： MCU 32BIT 32KB FLASH 24-QFN
特色產(chǎn)品： EFM32 Tiny Gecko
標準包裝： 1
系列： Tiny Gecko
核心處理器： ARM? Cortex?-M3
芯體尺寸： 32-位
速度： 32MHz
連通性： EBI/EMI，I²C，IrDA，智能卡，SPI，UART/USART
外圍設(shè)備： 欠壓檢測/復(fù)位，DMA，POR，PWM，WDT
輸入/輸出數(shù)： 17
程序存儲器容量： 32KB（32K x 8）
程序存儲器類型： 閃存
RAM 容量： 4K x 8
電壓 - 電源 (Vcc/Vdd)： 1.8 V ~ 3.8 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 2x12b，D/A 1x12b
振蕩器型： 外部
工作溫度： -40°C ~ 85°C
封裝/外殼： 24-VQFN 裸露焊盤
包裝： 標準包裝
其它名稱： 914-1033-6
...the world's most energy friendly microcontrollers
2011-02-04 - d0002_Rev1.00
111
www.energymicro.com
Software must follow this sequence because another higher priority exception might change the MMFAR
or BFAR value. For example, if a higher priority handler preempts the current fault handler, the other
fault might change the MMFAR or BFAR value.
4.4 System timer, SysTick
The processor has a 24-bit system timer, SysTick, that counts down from the reload value to zero, reloads
(wraps to) the value in the LOAD register on the next clock edge, then counts down on subsequent
clocks.
Note
When the processor is halted for debugging the counter does not decrement.
The system timer registers are:
Table 4.32. System timer registers summary
Address
Name
Type
Required
privilege
Reset value
Description
0xE000E010
CTRL
RW
Privileged
0x00000004
0xE000E014
LOAD
RW
Privileged
0x00000000
0xE000E018
VAL
RW
Privileged
0x00000000
0xE000E01C
CALIB
RO
Privileged
0x400036B0
1SysTick calibration value.
4.4.1 SysTick Control and Status Register
The SysTick CTRL register enables the SysTick features. See the register summary in Table 4.32 (p.
111) for its attributes. The bit assignments are:
0
Reserved
31
17 16 15
3 2 1 0
Reserved
0 0
COUNTFLAG
CLKSOURCE
TICKINT
ENABLE
Table 4.33. SysTick CTRL register bit assignments
Bits
Name
Function
[31:17]
-
Reserved.
[16]
COUNTFLAG
Returns 1 if timer counted to 0 since last time this was read.
[15:3]
-
Reserved.
[2]
CLKSOURCE
Indicates the clock source:
0 = Bit 0 of RTC counter value
1 = HFCORECLK
[1]
TICKINT
Enables SysTick exception request:
0 = counting down to zero does not assert the SysTick exception request
1 = counting down to zero to asserts the SysTick exception request.
Software can use COUNTFLAG to determine if SysTick has ever counted to zero.
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