NuMicro® NUC029LEE/NUC029SEE
32-bit Arm
®
Cortex
®
-M0 Microcontroller
Aug, 2018
Page
123
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497
Rev 1.00
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MICRO
®
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UC02
9L
E
E
/N
UC029
S
E
E
T
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CHN
ICA
L R
E
F
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R
E
NC
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M
A
NU
A
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Register Or
Instruction
Mode
SLEEPDEEP
(SCR[2])
PD_WAIT_CPU
(PWRCON[8])
PWR_DOWN_EN
(PWRCON[7])
CPU Run WFI
Instruction
Clock Disable
Normal operation
0
0
0
NO
All clocks disabled by control
register
Idle mode
(CPU entering Sleep
mode)
0
x
0
YES
Only CPU clock disabled
Power-down mode
(CPU entering Deep
Sleep mode)
1
1
1
YES
Most clocks are disabled except
10 kHz and 32.768 kHz, only
RTC/WDT/Timer/PWM
peripheral clock still enable if
their clock source are selected
as 10 kHz or 32.768 kHz.
Table 6.3-1 Chip Idle/Power-down Mode Control Table
When chip enters Power-down mode, user can wake-up chip using some interrupt sources. The
related interrupt sources and NVIC IRQ enable bits (NVIC_ISER) should be enabled before
setting the PWR_DOWN_EN bit in PWRCON[7] to ensure chip can enter Power-down and wake-
up successfully.