PXD20RM Datasheet, PDF (1093/1628 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

correctly entered and the transition process has completed. For a description of valid mode requests, please
refer to Section 29.4.5, Mode Transition Interrupts.
Any modification of the mode configuration register of the currently selected mode will not be taken into
account immediately but on the next request to enter this mode. This means that transition requests such
as RUN0…3  RUN0…3, DRUN  DRUN, SAFE  SAFE, and TEST  TEST are considered valid
mode transition requests. As soon as the mode request is accepted as valid, the S_MTRANS bit is set till
the status in the ME_GS register matches the configuration programmed in the respective
ME_<mode>_MC register.
NOTE
It is recommended that software poll the S_MTRANS bit in the ME_GS
register after requesting a transition to HALT, STOP, or STANDBY modes.
SYSTEM MODES ^recoverable
hardware failure
USER MODES
software
request
SAFE
RUN0
RUN1
HALT
RESET
DRUN
non-recoverable
failure
TEST
RUN2
RUN3
STOP
STANDBY
Figure 29-24. MC_ME Mode Diagram
29.4.2 Modes Details
29.4.2.1 RESET Mode
The device enters this mode on the following events:
• From SAFE, DRUN, RUN0…3, or TEST mode when the TARGET_MODE bit field of the
ME_MCTL register is written with “0000”
Freescale Semiconductor
PXD20 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
29-35