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NuMicro® NUC029LEE/NUC029SEE
32-bit Arm
®
Cortex
®
-M0 Microcontroller
Aug, 2018
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6.3.6 Register Description
System Power-down Control Register (PWRCON)
Except the BIT[6], all the other bits are protected, programming
these bits need to write “59h”, “16h”,
“88h” to address 0x5000_0100 to disable register protection. Refer to the register REGWRPROT at
address 0x100
Register
Offset
R/W
Description
Reset Value
PWRCON
0x00
R/W
System Power-down Control Register
0x0000_001X
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
OSC48M_EN
Reserved
PD_WAIT_
CPU
7
6
5
4
3
2
1
0
PWR_DOWN_
EN
PD_WU_STS
PD_WU_INT_
EN
PD_WU_DLY OSC10K_EN OSC22M_EN XTL32K_EN
XTL12M_EN
Bits
Description
[31:13]
Reserved
Reserved.
[12]
OSC48M_EN
48 MHz Internal High Speed RC Oscillator (HIRC48) Enable Bit (Write Protect)
0 = 48 MHz internal high speed RC oscillator (HIRC48) Disabled.
1 = 48 MHz internal high speed RC oscillator (HIRC48) Enabled.
Note:
This bit is write protected. Refer to the SYS_REGLCTL register.
[11:9]
Reserved
Reserved.
[8]
PD_WAIT_CPU
Power-Down Entry Condition Control (Write Protect)
0 = Chip enters Power-down mode when the PWR_DOWN_EN bit is set to 1.
1 = Chip enters Power- down mode when the both PD_WAIT_CPU and PWR_DOWN_EN
bits are set to 1 and CPU run WFI instruction.
Note:
This bit is the protected bit, and programming it needs to write “59h”, “16h”, and
“88h” to address 0x5000_0100 to disable register protection. Refer to the register
REGWRPROT at address 0x100.
[7]
PWR_DOWN_EN
System Power-Down Enable Bit (Write Protect)
When this bit is set to 1, Power-down mode is enabled and chip Power-down behavior will
depends on the PD_WAIT_CPU bit
(a) If the PD_WAIT_CPU is 0, the chip enters Power-down mode immediately after the
PWR_DOWN_EN bit set.
(b) if the PD_WAIT_CPU is 1, the chip keeps active till the CPU sleep mode is also active
and then the chip enters Power-down mode (recommend)
When chip wakes up from Power-down mode, this bit is cleared by hardware. User needs