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Chapter 9 Reset Generation Module (MC_RGM)
MPC5606BK Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
193
source event (except the power-on reset event) to be converted from a reset to either a SAFE mode request
issued to the MC_ME or to an interrupt request issued to the core.
Alternate event selection for a given reset source is made via the RGM_F/DERD and RGM_F/DEAR
registers, as shown in
The alternate event is cleared by deasserting the source of the request (that is, at the reset source that caused
the alternate request) and also clearing the appropriate RGM_F/DES status bit.
NOTE
Alternate requests (SAFE mode as well as interrupt requests) are generated
asynchronously.
NOTE
If a masked destructive reset event that is configured to generate a SAFE
mode/interrupt request occurs during PHASE0, it is ignored, and the
MC_RGM will not send any safe mode/interrupt request to the MC_ME.
The same is true for masked functional reset events during PHASE1.
9.4.6
Boot mode capturing
The MC_RGM samples PA[9:8] whenever RESET is asserted until five FIRC (16 MHz internal RC
oscillator) clock cycles before its deassertion edge. The result of the sampling is used at the beginning of
reset PHASE3 for boot mode selection and is retained after RESET has been deasserted for subsequent
boots after reset sequences during which RESET is not asserted.
NOTE
In order to ensure that the boot mode is correctly captured, the application
needs to apply the valid boot mode value the entire time that RESET is
asserted.
RESET can be asserted as a consequence of the internal reset generation.
This will force re-sampling of the boot mode pins. (See
details.)
Table 9-12. MC_RGM alternate event selection
RGM_F/DERD
bit value
RGM_F/DEAR
bit value
Generated event
0
X
Reset
1
0
SAFE mode request
1
1
Interrupt request
Содержание MPC5605BK
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