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NuMicro® NUC029LEE/NUC029SEE
32-bit Arm
®
Cortex
®
-M0 Microcontroller
Aug, 2018
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System Control Register (SCR)
Register
Offset
R/W
Description
Reset Value
SCR
0xD10
R/W
System Control Register
0x0000_0000
31
30
29
28
27
26
25
24
Reserved
23
22
21
20
19
18
17
16
Reserved
15
14
13
12
11
10
9
8
Reserved
7
6
5
4
3
2
1
0
Reserved
SEVONPEND
Reserved
SLEEPDEEP
SLEEPONEXIT
Reserved
Bits
Description
[31:5]
Reserved
Reserved.
[4]
SEVONPEND
Send Event On Pending Bit
0 = Only enabled interrupts or events can wake-up the processor, disabled interrupts are
excluded.
1 = Enabled events and all interrupts, including disabled interrupts, can wake-up the
processor.
When an event or interrupt enters pending state, the event signal wakes up the processor
from WFE. If the processor is not waiting for an event, the event is registered and affects
the next WFE.
The processor also wakes up on execution of an SEV instruction or an external event.
[3]
Reserved
Reserved.
[2]
SLEEPDEEP
Processor Deep Sleep And Sleep Mode Selection
Controls whether the processor uses sleep or deep sleep as its low power mode:
0 = Sleep mode.
1 = Deep Sleep mode.
[1]
SLEEPONEXIT
Sleep-On-Exit Enable Bit
This bit indicates sleep-on-exit when returning from Handler mode to Thread mode.
0 = Do not sleep when returning to Thread mode.
1 = Enter Sleep or Deep Sleep when returning from ISR to Thread mode.
Setting this bit to 1 enables an interrupt driven application to avoid returning to an empty
main application..
[0]
Reserved
Reserved.