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Interrupts and Events Registers

4.6.1.1 MCUWUSEL Register (Offset = 0h) [reset = X]

MCUWUSEL is shown in Figure 4-6 and described in Table 4-11.

Wake-up Selector For MCU This register contains pointers to 4 events which are routed to AON_WUC as

wakeup sources for MCU. AON_WUC will start a wakeup sequence for the MCU domain when either of

the 4 selected events are asserted. A wakeup sequence will guarantee that the MCU power switches are

turned on, LDO resources are available and SCLK_HF is available and selected as clock source for MCU.

Note: It is recommended ( or required when AON_WUC:MCUCLK.PWR_DWN_SRC=NONE) to also setup

a wakeup event here before MCU is requesting powerdown. ( PRCM requests uLDO, see conditions in

PRCM:VDCTL.ULDO ) as it will speed up the wakeup procedure.

Figure 4-6. MCUWUSEL Register

31 30 29 28 27 26 25 24

RESERVED WU3_EV

R-X R/W-3Fh

23 22 21 20 19 18 17 16

RESERVED WU2_EV

R-X R/W-3Fh

15 14 13 12 11 10 9 8

RESERVED WU1_EV

R-X R/W-3Fh

7 6 5 4 3 2 1 0

RESERVED WU0_EV

R-X R/W-3Fh

Table 4-11. MCUWUSEL Register Field Descriptions

Bit Field Type Reset Description

31-30 RESERVED R X

Software should not rely on the value of a reserved. Writing any

other value than the reset value may result in undefined behavior.

247

SWCU117A–February 2015–Revised March 2015 Interrupts and Events

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