PXD20RM Datasheet, PDF (1300/1628 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

37.3.1.7 Functional Event Short Sequence Register (RGM_FESS)
Address 0xC3FE_4018
Access: Supervisor read/write
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
0
W
POR 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Figure 37-8. Functional Event Short Sequence Register (RGM_FESS)
This register defines which reset sequence will be done when a functional reset sequence is triggered.The
functional reset sequence can either start from PHASE1 or from PHASE3, skipping PHASE1 and
PHASE2.
NOTE
This could be useful for fast reset sequence, for example to skip flash reset.
However, short sequence resets should not be used when in a mode with
Flash configured to power-down state. In this case a full PHASE1 reset is
required in order to power up the Flash - therefore FESS should be set to
0x0.
NOTE
If any functional event is defined to perform a short reset sequence then it
will not also assert the external reset pin even if that option is selected in the
RGM_FBRE register. Short reset sequences can be useful to allow a fast
reset sequence, for example to skip flash reset.
It can be accessed in read/write in either supervisor mode or test mode. It can be accessed in read in user
mode.
Table 37-9. Functional Event Short Sequence Register (RGM_FESS) Field Descriptions
Field
Description
SS_EXR
Short Sequence for External Reset
0 The reset sequence triggered by an external reset event will start from PHASE1
1 The reset sequence triggered by an external reset event will start from PHASE3, skipping PHASE1 and
PHASE2
SS_FLASH
Short Sequence for code or data flash fatal error
0 The reset sequence triggered by a code or data flash fatal error event will start from PHASE1
1 The reset sequence triggered by a code or data flash fatal error event will start from PHASE3, skipping
PHASE1 and PHASE2
SS_LVD45
Short Sequence for 4.5V low-voltage detected
0 The reset sequence triggered by a 4.5V low-voltage detected event will start from PHASE1
1 The reset sequence triggered by a 4.5V low-voltage detected event will start from PHASE3, skipping PHASE1
and PHASE2
37-24
PXD20 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
Freescale Semiconductor