Safety
MPC5606S Microcontroller Reference Manual, Rev. 7
120
Freescale Semiconductor
requires periodic execution of a watchdog servicing sequence. Writing the sequence resets the timer to a
specified timeout period. If this servicing action does not occur before the timer expires the SWT generates
an interrupt or hardware reset. The SWT can be configured to generate a reset or interrupt on an initial
timeout, a reset is always generated on a second consecutive timeout.
The SWT provides a window functionality. When this functionality is programmed, the servicing action
should take place within the defined window. When occurring outside the defined period, the SWT will
generate a reset.
4.2.2
Features
The SWT has the following features:
•
32-bit timeout register to set the timeout period
•
The unique SWT counter clock is the undivided low-power internal oscillator (IRC 128 khz), no
other clock source can be selected
•
Programmable selection of window mode or regular servicing
•
Programmable selection of reset or interrupt on an initial timeout
•
Master access protection
•
Hard and soft configuration lock bits
•
The SWT is started on Phase1 exit and counts unconditionally during Phase2 to monitor flash boot
sequence. SWT is held in reset during Phase3 but can start again at Phase3 exit depending on the
value of the shadow flash configuration bit NVUSR0[WATCHDOG_EN].
4.2.3
Modes of operation
When enabled, the SWT is always active in all modes except Standby when it is always disabled.
To simplify software development it is possible to temporarily suspend the SWT counter while the MCU
is stopped by a debugger. While the MCU is running the SWT counter runs normally. This feature is
enabled by setting the SWT_CR[FRZ] bit and is only available when the CPU has debug mode active (see
the CPU reference manual for more information on debug mode and support).
Software watchdog is not available in Standby mode. As soon as out of Standby mode, the SWT behaves
as in a usual “out of reset” situation.
shows the operation timing diagram of the SWT.
describes the SWT operation after
reset.
Содержание MPC5602S
Страница 76: ...Overview MPC5606S Microcontroller Reference Manual Rev 7 74 Freescale Semiconductor...
Страница 82: ...Memory Map MPC5606S Microcontroller Reference Manual Rev 7 80 Freescale Semiconductor...
Страница 112: ...Signal Description MPC5606S Microcontroller Reference Manual Rev 7 110 Freescale Semiconductor...
Страница 166: ...Analog to Digital Converter ADC MPC5606S Microcontroller Reference Manual Rev 7 164 Freescale Semiconductor...
Страница 182: ...Boot Assist Module BAM MPC5606S Microcontroller Reference Manual Rev 7 180 Freescale Semiconductor...
Страница 234: ...Clock Description MPC5606S Microcontroller Reference Manual Rev 7 232 Freescale Semiconductor...
Страница 286: ...Crossbar Switch XBAR MPC5606S Microcontroller Reference Manual Rev 7 284 Freescale Semiconductor...
Страница 470: ...e200z0h Core MPC5606S Microcontroller Reference Manual Rev 7 468 Freescale Semiconductor...
Страница 524: ...Enhanced Direct Memory Access eDMA MPC5606S Microcontroller Reference Manual Rev 7 522 Freescale Semiconductor...
Страница 546: ...Error Correction Status Module ECSM MPC5606S Microcontroller Reference Manual Rev 7 544 Freescale Semiconductor...
Страница 669: ...Flash Memory MPC5606S Microcontroller Reference Manual Rev 7 Freescale Semiconductor 667...
Страница 670: ...Flash Memory MPC5606S Microcontroller Reference Manual Rev 7 668 Freescale Semiconductor...
Страница 716: ...FlexCAN MPC5606S Microcontroller Reference Manual Rev 7 714 Freescale Semiconductor...
Страница 882: ...LIN Controller LINFlex MPC5606S Microcontroller Reference Manual Rev 7 880 Freescale Semiconductor...
Страница 901: ...Memory Protection Unit MPU MPC5606S Microcontroller Reference Manual Rev 7 Freescale Semiconductor 899...
Страница 902: ...Memory Protection Unit MPU MPC5606S Microcontroller Reference Manual Rev 7 900 Freescale Semiconductor...
Страница 955: ...Mode Entry Module MC_ME MPC5606S Microcontroller Reference Manual Rev 7 Freescale Semiconductor 953...
Страница 956: ...Mode Entry Module MC_ME MPC5606S Microcontroller Reference Manual Rev 7 954 Freescale Semiconductor...
Страница 1072: ...Quad Serial Peripheral Interface QuadSPI MPC5606S Microcontroller Reference Manual Rev 7 1070 Freescale Semiconductor...
Страница 1096: ...Reset Generation Module MC_RGM MPC5606S Microcontroller Reference Manual Rev 7 1094 Freescale Semiconductor...
Страница 1106: ...Real Time Clock RTC API MPC5606S Microcontroller Reference Manual Rev 7 1104 Freescale Semiconductor...
Страница 1186: ...Stepper Stall Detect SSD MPC5606S Microcontroller Reference Manual Rev 7 1184 Freescale Semiconductor...
Страница 1213: ...System Integration Unit Lite SIUL MPC5606S Microcontroller Reference Manual Rev 7 Freescale Semiconductor 1211...
Страница 1214: ...System Integration Unit Lite SIUL MPC5606S Microcontroller Reference Manual Rev 7 1212 Freescale Semiconductor...
Страница 1238: ...Voltage Regulators and Power Supplies MPC5606S Microcontroller Reference Manual Rev 7 1236 Freescale Semiconductor...
Страница 1252: ...Wakeup Unit WKPU MPC5606S Microcontroller Reference Manual Rev 7 1250 Freescale Semiconductor...
Страница 1258: ...Registers Under Protection MPC5606S Microcontroller Reference Manual Rev 7 1256 Freescale Semiconductor...
Страница 1323: ...Register Map MPC5606S Microcontroller Reference Manual Rev 7 Freescale Semiconductor 1321...
Страница 1324: ...Register Map MPC5606S Microcontroller Reference Manual Rev 7 1322 Freescale Semiconductor...