Emu_Em4Ctrl - Em4 Control - Silicon Laboratories EFR32xG21 Wireless Gecko Reference Manual

12.5.6 EMU_EM4CTRL - EM4 Control

Offset
0x06C
Reset
Access
Name
Bit Name
31:6 Reserved
5:4 EM4IORETMODE
Determine when IO retention will be applied and removed
Value
0
1
2
3:2 Reserved
1:0 EM4ENTRY
This field is used to enter the Energy Mode 4 sequence. Writing the sequence 2,3,2,3,2,3,2,3,2 will enter the part into
Energy Mode 4
silabs.com | Building a more connected world.
Bit Position
Reset Access Description
To ensure compatibility with future devices, always write bits to 0. More information in
ventions
0x0 RW EM4 IO retention mode
Mode Description
DISABLE No Retention: Pads enter reset state when entering EM4
EM4EXIT Retention through EM4: Pads enter reset state when exiting
EM4
SWUNLATCH Retention through EM4 and Wakeup: software sets EM4UN-
LATCH in EMU_CMD register to remove retention
To ensure compatibility with future devices, always write bits to 0. More information in
ventions
0x0 RW EM4 entry request
Reference Manual
EMU - Energy Management Unit
1.2 Con-
1.2 Con-
Rev. 0.4 | 270