参数资料
型号: EFM32-TG-STK3300
厂商: Energy Micro
文件页数: 15/136页
文件大小: 0K
描述: KIT STARTER EFM32 GECKO
特色产品: EFM32 Tiny Gecko
标准包装: 1
系列: EFM®32
类型: MCU
适用于相关产品: EFM32-TGXXX
所含物品: 板,线缆,CD 和文档
其它名称: 914-1018
...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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