ISD94100 Series Technical Reference Manual
Sep 9, 2019
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Wake-up sources in Power-down mode:
Table 6.2.5-5 lists all wake-up sources that can wake chip up from power down mode to normal
mode, wake-up condition and conditions on how to re-enter the power down mode again.
User needs to wait this condition before setting PDEN(CLK_PWRCTL[7]) and execute WFI to enter
Power-down mode.
Note that before entering each power down mode, user needs to enable wake-up source NVIC
interrupt and make sure that other peripherals’ interrupt are disabled. In addition, if BOD function is
enabled, BOD NVIC interrupt must be enabled before entering power down mode.
Wake-Up
Source
Wake-Up Condition
Power down mode
Condition that System Re-enter Power-Down Mode *
PD/
LLPD
SPD0/1 DPD
BOD
Brown-Out Detector
Interrupt
Y
N
N
After software writes 1 to clear BODIF (SYS_BODCTL[4]).
BOD
Brown-Out Detector
Interrupt
N
Y
N
BODWK(CLK_PMUSTS[4]) is cleared when SPD mode is
entered.
LVR
LVR Reset
Y
Y
N
After software writes 1 to clear LVRF(SYS_RSTSTS[3])
POR
POR Reset
N
N
Y
PORWK(CLK_PMUSTS[0]) is cleared when DPD mode is
entered.
POR
POR Reset
Y
Y
N
After software writes 1 to clear PORF(SYS_RSTSTS[0])
INT
External Interrupt
Y
N
N
After software write 1 to clear the Px_INTSRC[n] bit.
GPIO
GPIO Interrupt
Y
N
N
After software write 1 to clear the Px_INTSRC[n] bit.
GPIO(PA~PD)
Wake-up pin
rising or falling edge
event, 58-pin
N
Y
N
GPxWK(CLK_PMUSTS[11:8]) is cleared when SPD mode
is entered.
GPIO(PA.15)
Wake-up pin
rising or falling edge
event , 1-pin
N
N
Y
PINWK(CLK_PMUSTS[1]) is cleared when DPD mode is
entered.
TIMER
Timer Interrupt
Y
N
N
After software writes 1 to clear TWKF
(TIMERx_INTSTS[1]) and TIF (TIMERx_INTSTS[0]).
Wakeup timer
Wakeup by wake-up
timer time-out
N
Y
Y
DPD_TMRWK (CLK_PMUSTS[2]) or SPD_TMRWK
(CLK_PMUSTS[6]) is cleared when SPD or DPD mode is
entered.
WDT
WDT Interrupt
Y
N
N
After software writes 1 to clear WKF (WDT_CTL[5]) (Write
Protected).
RTC
Alarm Interrupt
Y
N
N
After software writes 1 to clear ALMIF (RTC_INTSTS[0]).
Time Tick Interrupt
Y
N
N
After software writes 1 to clear TICKIF (RTC_INTSTS[1]).
RTC
Wakeup by RTC
alarm
N
Y
N
RTCWK(CLK_PMUSTS[5]) is cleared when SPD mode is
entered.
Wakeup by RTC tick
time
N
Y
N
RTCWK(CLK_PMUSTS[5]) is cleared when SPD mode is
entered.
UART
nCTS wake-up
Y
N
N
After software writes 1 to clear CTSWKF
(UARTx_WKSTS[0]).
RX Data wake-up
Y
N
N
After software writes 1 to clear DATWKF
(UARTx_WKSTS[1]).
Received FIFO
Y
N
N
After software writes 1 to clear RFRTWKF
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