NXP Semiconductors MPC5605BK, Reference Manual, Page: 181 / 964

Chapter 9 Reset Generation Module (MC_RGM)
MPC5606BK Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor 181
• Bidirectional reset behavior configuration
• Chapter 8, Mode Entry Module (MC_ME) Boot mode capture on RESET deassertion
9.1.3 Modes of operation
The different reset sources are organized into two families: destructive and functional.
• A destructive reset source is associated with an event related to a critical—usually hardware—error
or dysfunction. When a destructive reset event occurs, the full reset sequence is applied to the
device starting from PHASE0. This resets the full device ensuring a safe start-up state for both
digital and analog modules. Destructive resets are
– Power-on reset
• A functional reset source is associated with an event related to a less-critical—usually
non-hardware—error or dysfunction. When a functional reset event occurs, a partial reset sequence
is applied to the device starting from PHASE1. In this case, most digital modules are reset
normally, while analog modules or specific digital modules’ (e.g. debug modules, flash modules)
state is preserved. Functional resets are
– External reset
When a reset is triggered, the MC_RGM state machine is activated and proceeds through the different
phases (i.e. PHASE
n states). Each phase is associated with a particular device reset being provided to the
system. A phase is completed when all corresponding phase completion gates from either the system or
internal to the MC_RGM are acknowledged. The device reset associated with the phase is then released,
and the state machine proceeds to the next phase up to entering the IDLE phase. During this entire process,
the MC_ME state machine is held in RESET mode. Only at the end of the reset sequence, when the IDLE
phase is reached, does the MC_ME enter the DRUN mode.
Alternatively, it is possible for software to configure some reset source events to be converted from a reset
to either a SAFE mode request issued to the MC_ME or to an interrupt issued to the core (see
Section 9.3.1.4, Destructive Event Reset Disable Register (RGM_DERD) , and Section 9.3.1.6,
Destructive Event Alternate Request Register (RGM_DEAR) , for destructive resets, and Section 9.3.1.3,
Functional Event Reset Disable Register (RGM_FERD) , and Section 9.3.1.5, Functional Event Alternate
Request Register (RGM_FEAR) , for functional resets).
9.2 External signal description
The MC_RGM interfaces to the reset pin RESET and the boot mode pins PA[8] and PA[9].