Data Sheet

NUC123
May 3, 2017 Page 38 of 99 Rev.2.04
NUC123 SERIES DATASHEET
WDT
WDT Interrupt
After software writes 1 to clear WTWKF (WTCR[5]) (Write Protect).
UART
nCTS wake-up
After software writes 1 to clear DCTSF (UA_MSR[0]).
I
2
C
Addressing I
2
C device
After software writes 1 to clear WKUPIF (I2CWKUPSTS[0]).
USB
Remote Wake-up
After software writes 1 to clear BUS_STS (USBD_INTSTS[0]).
Table 6-4Table 6-4 lists the condition about how to enter Power-down mode again for each
peripheral.
*User needs to wait this condition before setting PWR_DOWN_EN (PWRCON[7]) and execute WFI to
enter Power-down mode.
Wake-Up
Source
Wake-Up Condition
System Can Enter Power-Down Mode Again Condition*
BOD
Brown-Out Detector Interrupt
After software writes 1 to clear BOD_INTF (BODCR[4]).
GPIO
GPIO Interrupt
After software write 1 to clear the ISRC[n] bit.
TIMER
Timer Interrupt
After software writes 1 to clear TWF (TISRx[1]) and TIF (TISRx[0]).
WDT
WDT Interrupt
After software writes 1 to clear WTWKF (WTCR[5]) (Write Protect).
UART
nCTS wake-up
After software writes 1 to clear DCTSF (UA_MSR[0]).
I
2
C
Addressing I
2
C device
After software writes 1 to clear WKUPIF (I2CWKUPSTS[0]).
USB
Remote Wake-up
After software writes 1 to clear BUS_STS (USBD_INTSTS[0]).
Table 6-4 Condition of Entering Power-down Mode Again