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PM0056 датащи(PDF) 151 Page - STMicroelectronics

номер детали PM0056
подробное описание детали  This programming manual provides information
PDF  156 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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PM0056 датащи(HTML) 151 Page - STMicroelectronics

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PM0056
Core peripherals
4.5.1
SysTick control and status register (STK_CTRL)
Address offset: 0x00
Reset value: 0x0000 0000
Required privilege: Privileged
The SysTick CTRL register enables the SysTick features.
31
3029
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
76
54
3
21
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 clock source.
0: AHB/8
1: Processor clock (AHB)
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.
Note: Software can use COUNTFLAG to determine if SysTick has ever counted to zero.
Bit 0
ENABLE: Counter enable
Enables the counter. 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.
0: Counter disabled
1: Counter enabled



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