Mode Entry Module (MC_ME) RM0046
138/936 Doc ID 16912 Rev 5
6.1.2 Features
The MC_ME includes the following features:
● control of the available modes by the ME_ME register
● definition of various device mode configurations by the ME_<mode>_MC registers
● control of the actual device mode by the ME_MCTL register
● capture of the current mode and various resource status within the contents of the
ME_GS register
● optional generation of various mode transition interrupts
● status bits for each cause of invalid mode transitions
● peripheral clock gating control based on the ME_RUN_PC0…7, ME_LP_PC0…7, and
ME_PCTL0…143 registers
● capture of current peripheral clock gated/enabled status
6.1.3 Modes of Operation
The MC_ME is based on several device modes corresponding to different usage models of
the device. Each mode is configurable and can define a policy for energy and processing
power management to fit particular system requirements. An application can easily switch
from one mode to another depending on the current needs of the system. The operating
modes controlled by the MC_ME are divided into system and user modes. The system
modes are modes such as RESET, DRUN, SAFE, and TEST. These modes aim to ease the
configuration and monitoring of the system. The user modes are modes such as RUN0…3,
HALT0, and STOP0 which can be configured to meet the application requirements in terms
of energy management and available processing power. The modes DRUN, SAFE, TEST,
and RUN0…3 are the device software running modes.
Table 3 6 describes the MC_ME modes.
Table 36. MC_ME Mode Descriptions
Name Description Entry Exit
RESET
This is a chip-wide virtual mode during which the
application is not active. The system remains in this mode
until all resources are available for the embedded software
to take control of the device. It manages hardware
initialization of chip configuration, voltage regulators, clock
sources, and flash modules.
system reset
assertion from
MC_RGM
system reset
deassertion from
MC_RGM
DRUN
This is the entry mode for the embedded software. It
provides full accessibility to the system and enables the
configuration of the system at startup. It provides the
unique gate to enter user modes. BAM when present is
executed in DRUN mode.
system reset
deassertion from
MC_RGM,
software request
from SAFE, TEST
and RUN0…3
system reset
assertion,
RUN0…3, TEST
via software, SAFE
via software or
hardware failure.
SAFE
This is a chip-wide service mode which may be entered on
the detection of a recoverable error. It forces the system
into a pre-defined safe configuration from which the system
may try to recover.
hardware failure,
software request
from DRUN, TEST,
and RUN0…3
system reset
assertion, DRUN
via software
TEST
This is a chip-wide service mode which is intended to
provide a control environment for device software teting.
software request
from DRUN
system reset
assertion, DRUN
via software
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