MPC5604B/C Microcontroller Reference Manual, Rev. 8
Freescale Semiconductor 195
NOTE
The F_POR flag is automatically cleared on a 1.2 V low-voltage detected
(power domain #0 or #1) or a 2.7 V low-voltage detected. This means that
if the power-up sequence is not monotonic (i.e the voltage rises and then
drops enough to trigger a low-voltage detection), the F_POR flag may not
be set but instead the F_LVD12_PD0, F_LVD12_PD1, or F_LVD27 flag is
set on exiting the reset sequence. Therefore, if the F_POR, F_LVD12_PD0,
F_LVD12_PD1, or F_LVD27 flags are set on reset exit, software should
interpret the reset cause as power-on.
NOTE
In contrast to all other reset sources, the 1.2 V low-voltage detected (power
domain #0) event is captured on its deassertion. Therefore, the status bit
F_LVD12_PD0 is also asserted on the reset’s deassertion. In case an
alternate event is selected, the SAFE mode or interrupt request are similarly
asserted on the reset’s deassertion.
9.3.1.3 Functional Event Reset Disable Register (RGM_FERD)
F_SWT Flag for software watchdog timer
0 No software watchdog timer event has occurred since either the last clear or the last power-on
reset assertion
1 A software watchdog timer event has occurred
F_LVD12_P
D1
Flag for 1.2 V low-voltage detected (power domain #1)
0 No 1.2 V low-voltage detected (power domain #1) event has occurred since either the last clear or
the last power-on reset assertion
1 A 1.2 V low-voltage detected (power domain #1) event has occurred
F_LVD12_P
D0
Flag for 1.2 V low-voltage detected (power domain #0)
0 No 1.2 V low-voltage detected (power domain #0) event has occurred since either the last clear or
the last power-on reset assertion
1 A 1.2 V low-voltage detected (power domain #0) event has occurred
Address 0xC3FE_4004 Access: Supervisor read/write
0123456789101112131415
R
D_EXR
000000
D_FLASH
D_LVD45
D_CMU_FHL
D_CMU_OLR
D_FMPLL
D_CHKSTOP
D_SOFT
D_CORE
D_JTAG
W
POR0000000000000000
Figure 9-4. Functional Event Reset Disable Register (RGM_FERD)
Table 9-4. Destructive Event Status Register (RGM_DES) Field Descriptions (continued)
Field Description
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