Information

14.3.4 Power Mode Status Register (SMC_PMSTAT)

PMSTAT is a read-only, one-hot register which indicates the current power mode of the

system.

NOTE

This register is reset on Chip POR not VLLS and by reset types

that trigger Chip POR not VLLS. It is unaffected by reset types

that do not trigger Chip POR not VLLS. See the Reset section

details. for more information.

Address: SMC_PMSTAT is 4007_E000h base + 3h offset = 4007_E003h

Bit 7 6 5 4 3 2 1 0

Read 0 PMSTAT

Write

Reset

0 0 0 0 0 0 0 1

SMC_PMSTAT field descriptions

Field Description

Reserved

This read-only field is reserved and always has the value zero.

6–0

PMSTAT NOTE: When debug is enabled, the PMSTAT will not update to STOP or VLPS

000_0001 Current power mode is RUN

000_0010 Current power mode is STOP

000_0100 Current power mode is VLPR

000_1000 Current power mode is VLPW

001_0000 Current power mode is VLPS

010_0000 Current power mode is LLS

100_0000 Current power mode is VLLS

Functional Description

14.4.1 Power mode transitions

The following figure shows the power mode state transitions available on the chip. Any

reset always brings the MCU back to the normal run state.

14.4

Functional Description

K20 Sub-Family Reference Manual, Rev. 2, Feb 2012

268 Freescale Semiconductor, Inc.