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M451
May. 4, 2018
Page
181
of
1006
Rev.2.08
M4
51
S
E
RI
E
S
T
E
CH
NICA
L RE
F
E
R
E
NC
E
M
A
NU
A
L
Table 6-3 Clocks in Power Modes
Wake-up sources in Power-down mode:
RTC, WDT, I²C, Timer, UART, BOD, GPIO, USBH, USBD, OTG, CAN and ACMP
After chip enters power down, the following wake-up sources can wake chip up to normal mode.
Table 6-4 lists the condition about how to enter Power-down mode again for each peripheral.
*User needs to wait this condition before setting PDEN(CLK_PWRCTL[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 SYS_BODCTL[BODIF].
GPIO
GPIO Interrupt
After software write 1 to clear the INTSRC[n] bit.
TIMER
Timer Interrupt
After software writes 1 to clear TWKF (TIMERx_INTSTS[1]) and TIF
(TIMERx_INTSTS[0]).
WDT
WDT Interrupt
After software writes 1 to clear WKF (WDT_CTL[5]) (Write Protect).
RTC
Alarm Interrupt
After software writes 1 to clear ALMIF (RTC_INTSTS[0]).
Time Tick Interrupt
After software writes 1 to clear TICKIF (RTC_INTSTS[1]).
Snoop Detection Interrupt After software writes 1 to clear SNPDIF (RTC_INTSTS[2]).
UART
RX Data wake-up
After software writes 1 to clear DATWKIF (UARTx_INTSTS[17]).
nCTS wake-up
After software writes 1 to clear CTSWKIF (UARTx_INTSTS[16]).
I
2
C
Falling edge in the I2C_SDA
or I2C_CLK
After software writes 1 to clear WKIF( I2C_WKSTS[0]).
USBH
Remote Wake-up
After software writes 1 to clear CSC (HcRhPortStatus1[16]).
USBD
Remote Wake-up
After software writes 1 to clear BUSIF (USBD_INTSTS[0]).
OTG
OTG ID Pin Wake-Up
After software writes 1 to clear OTG_INTSTS[IDCHGIF].
CAN
Falling edge in the CAN_RX After software writes 0 to clear WAKUP_STS (CAN_WU_STATUS [0]).
ACMP
Comparator Power-Down
Wake-Up Interrupt
After software writes 1 to clear ACMP_STATUS[WKIFx].
Table 6-4 Condition of Entering Power-down Mode Again
6.2.4 System Power Distribution
In this chip, power distribution is divided into five segments:
Analog power from AV
DD
and AV
SS
provides the power for analog components
operation. The V
REF
should be connected with an external 1uF capacitor that should
be located close to the V
REF
pin to avoid power noise for analog applications.
Digital power from V
DD
and V
SS
supplies the power to the internal regulator which
provides a fixed 1.8 V power for digital operation and I/O pins.
USB transceiver power from V
BUS
(M45xD/M45xC Only) or from V
DD
(M45xG/M45xE
Only) offers the power for operating the USB transceiver.
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