
M451
May. 4, 2018
Page
178
of
1006
Rev.2.08
M4
51
S
E
RI
E
S
T
E
CH
NICA
L RE
F
E
R
E
NC
E
M
A
NU
A
L
AV
DD
V
BODL
BODOUT
BODRSTEN
Brown-out
Reset
T
1
(< BODDGSEL)
T
2
(= BODDGSEL)
T
3
(= BODDGSEL)
Hysteresis
V
BODH
Figure 6.2-5 Brown-out Detector (BOD) Waveform
Watchdog Timer Reset (WDT)
6.2.2.5
In most industrial applications, system reliability is very important. To automatically recover the
MCU from failure status is one way to improve system reliability. The watchdog timer(WDT) is
widely used to check if the system works fine. If the MCU is crashed or out of control, it may
cause the watchdog time-out. User may decide to enable system reset during watchdog time-out
to recover the system and take action for the system crash/out-of-control after reset.
Software can check if the reset is caused by watchdog time-out to indicate the previous reset is a
watchdog reset and handle the failure of MCU after watchdog time-out reset by checking
WDTRF(SYS_RSTSTS[2]).
CPU Lockup Reset (M45xD/M45xC Only)
6.2.2.6
CPU enters lockup status after CPU produces hardfault at hardfault handler and chip gives
immediate indication of seriously errant kernel software. This is the result of the CPU being locked
because of an unrecoverable exception following the activation of the processor’s built in system
state protection hardware. When chip enters debug mode, the CPU lockup reset will be ignored.
CPU Reset, CHIP Reset and MCU Reset
6.2.2.7
The CPU Reset means only Cortex
®
-M4 core is reset and all other peripherals remain the same
status after CPU reset. User can set the CPURST(SYS_IPRST0[1]) to 1 to assert the CPU Reset
signal.
The CHIP Reset is same with Power-On Reset. The CPU and all peripherals are reset and
BS(FMC_ISPCTL[1]) bit is automatically reloaded from CONFIG setting. User can set the
CHIPRST(SYS_IPRST0[1]) to 1 to assert the CHIP Reset signal.
The MCU Reset is similar with CHIP Reset. The difference is that BS(FMC_ISPCTL[1]) will not be
Содержание ARM Cortex NuMicro M451 Series
Страница 301: ...M451 May 4 2018 Page 301 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL...
Страница 324: ...M451 May 4 2018 Page 324 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL Figure 6 4 18 Checksum Calculation Flow...
Страница 355: ...M451 May 4 2018 Page 355 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL 2 0 Reserved Reserved...
Страница 625: ...M451 May 4 2018 Page 625 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL 00 5 bits 01 6 bits 10 7 bits 11 8 bits...
Страница 721: ...M451 May 4 2018 Page 721 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL the SCL line 1 0 Reserved Reserved...
Страница 1001: ...M451 May 4 2018 Page 1001 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL LQFP 64L 10x10x1 4 mm footprint 2 0 mm 9 2...
Страница 1002: ...M451 May 4 2018 Page 1002 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL LQFP 64L 7x7x1 4 mm footprint 2 0 mm 9 3...
Страница 1003: ...M451 May 4 2018 Page 1003 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL LQFP 48L 7x7x1 4mm footprint 2 0mm 9 4...