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Chapter 9 Reset Generation Module (MC_RGM)
MPC5606BK Microcontroller Reference Manual, Rev. 2
188
Freescale Semiconductor
9.4
Functional description
9.4.1
Reset state machine
The main role of MC_RGM is the generation of the reset sequence, which ensures that the correct parts of
the device are reset based on the reset source event. This is summarized in
NOTE
JTAG logic has its own independent reset control and is not controlled by
the MC_RGM in any way.
The reset sequence is comprised of five phases managed by a state machine, which ensures that all phases
are correctly processed through waiting for a minimum duration and until all processes that need to occur
during that phase have been completed before proceeding to the next phase.
The state machine used to produce the reset sequence is shown in
.
Table 9-10. Functional Bidirectional Reset Enable Register (RGM_FBRE) field descriptions
Field
Description
BE_EXR
Bidirectional Reset Enable for External Reset
0 RESET is asserted on an
external
reset event if the reset is enabled
1 RESET is not asserted on an
external
reset event
Table 9-11. MC_RGM Reset Implications
Source
What Gets Reset
External Reset
Assertion
Boot Mode
Capture
Power-on Reset
All
Yes
Yes
Destructive reset
All except some clock/reset management
Yes
Yes
External reset
All except some clock/reset management and
debug
Yes
Yes
Functional resets
All except some clock/reset management and
debug
Programmable
1
1
the assertion of the external reset is controlled via the RGM_FBRE register
Programmable
2
2
the boot mode is captured if the external reset is asserted
Shortened functional resets
3
3
the short sequence is enabled via the RGM_FESS register
Flip-flops except some clock/reset management
Programmable
1
Programmable
2
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