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Chapter 9 Reset Generation Module (MC_RGM)
MPC5606BK Microcontroller Reference Manual, Rev. 2
192
Freescale Semiconductor
9.4.3
External reset
The MC_RGM manages the external reset coming from RESET. The detection of a falling edge on RESET
will start the reset sequence from the beginning of PHASE1.
The status flag associated with the external reset falling edge event (RGM_FES.F_EXR bit) is set when
the external reset is asserted and the power-on reset is not asserted.
The external reset can optionally be disabled by writing bit RGM_FERD.D_EXR.
NOTE
The RGM_FERD register can be written only once between two power-on
reset events.
An enabled external reset will normally trigger a reset sequence starting from the beginning of PHASE1.
Nevertheless, the RGM_FESS register enables the further configuring of the reset sequence triggered by
the external reset. When RGM_FESS.SS_EXR is set, the external reset will trigger a reset sequence
starting directly from the beginning of PHASE3, skipping PHASE1 and PHASE2. This can be useful
especially when an external reset should not reset the flash.
9.4.4
Functional resets
A functional reset indicates that an event has occurred, after which it can be guaranteed that critical register
and memory content is still intact.
The status flag associated with a given functional reset event (RGM_FES.F_
<functional reset>
bit) is set
when the functional reset is asserted and the power-on reset is not asserted. It is possible for multiple status
bits to be set simultaneously, and it is software’s responsibility to determine which reset source is the most
critical for the application.
The functional reset can be optionally disabled by software writing bit
RGM_FERD.D_
<functional reset>
.
NOTE
The RGM_FERD register can be written only once between two power-on
reset events.
An enabled functional reset will normally trigger a reset sequence starting from the beginning of PHASE1.
Nevertheless, the RGM_FESS register enables the further configuring of the reset sequence triggered by
a functional reset. When RGM_FESS.SS_
<functional reset>
is set, the associated functional reset will
trigger a reset sequence starting directly from the beginning of PHASE3, skipping PHASE1 and PHASE2.
This can be useful especially in case a functional reset should not reset the flash module.
Chapter 8, Mode Entry Module (MC_ME)
, for details on the STANDBY and DRUN modes.
9.4.5
Alternate event generation
The MC_RGM provides alternative events to be generated on reset source assertion. When a reset source
is asserted, the MC_RGM normally enters the reset sequence. Alternatively, it is possible for each reset
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