PXS20RM Datasheet, PDF (1095/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

Mode Entry Module (MC_ME)
Table 32-16. MC_ME Resource Control Overview (continued)
Resourc
e
MVREG
PDO
RESET
on
off
TEST
on

off
SAFE
on

on
Mode
DRUN
on
RUN0…3
on
HALT0

on
off
off
off
STOP0

on

off
32.4.3.3 Peripheral Clocks Disable
On completion of the Target Mode Request step, the MC_ME requests each peripheral to enter its stop
mode when:
• the peripheral is configured to be disabled via the target mode, the peripheral configuration
registers ME_RUN_PC0…7 and ME_LP_PC0…7, and the peripheral control registers
ME_PCTL0…143
CAUTION
For cut1: The MC_ME does not automatically request peripherals to enter
their stop modes if the power domains in which they are residing are to be
turned off due to a mode change. Therefore, it is software’s responsibility to
ensure that those peripherals that are to be powered down are configured in
the MC_ME to be frozen.
NOTE
For cut2/3: The MC_ME automatically requests peripherals to enter their
stop modes if the power domains in which they are residing are to be turned
off due to a mode change. However, it is good practice for software to ensure
that those peripherals that are to be powered down are configured in the
MC_ME to be frozen.
Each peripheral acknowledges its stop mode request after closing its internal activity. The MC_ME then
disables the corresponding clock(s) to this peripheral.
In the case of a SAFE mode transition request, the MC_ME does not wait for the peripherals to
acknowledge the stop requests. The SAFE mode clock gating configuration is applied immediately
regardless of the status of the peripherals’ stop acknowledges.
Please refer to Section 32.4.6, Peripheral Clock Gating for more details.
Each peripheral that may block or disrupt a communication bus to which it is connected ensures that these
outputs are forced to a safe or recessive state when the device enters the SAFE mode.
Freescale Semiconductor
PXS20 Microcontroller Reference Manual, Rev. 1
32-39