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PM0215 Datasheet(PDF) 86 Page - STMicroelectronics

No. de pieza PM0215
Descripción Electrónicos  STM32F0xxx Cortex-M0 programming manual
PDF  91 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM0215 Datasheet(HTML) 86 Page - STMicroelectronics

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Core peripherals
PM0215
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Doc ID 022979 Rev 1
4.4.1
SysTick control and status register (STK_CSR)
Address offset: 0x00
Reset value: 0x0000 0004
The SysTick CSR register enables the SysTick features.
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
Reserved
COUNT
FLAG
rw
15
14
13
12
11
10
9
8
7
6
5
4321
0
Reserved
CLKSO
URCE
TICK
INT
EN
ABLE
rw
rw
rw
Bits 31:17 Reserved, must be kept cleared.
Bit 16 COUNTFLAG:
Returns 1 if timer counted to 0 since last time this was read.
Bits 15:3 Reserved, must be kept cleared.
Bit 2 CLKSOURCE: Clock source selection
Selects the timer clock source.
0: External reference clock
1: Processor clock
Bit 1 TICKINT: SysTick exception request enable
0: Counting down to zero does not assert the SysTick exception request
1: Counting down to zero to asserts the SysTick exception request.
Bit 0 ENABLE: Counter enable
Enables the counter. When ENABLE is set to 1, the counter starts counting 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.
0: Counter disabled
1: Counter enabled



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