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• One output port, EWM_OUT_b, when asserted is used to reset or place the external
circuit into safe mode.
• One Input port, EWM_in, allows an external circuit to control the assertion of the
EWM_OUT_b signal.
18.2.2 Modes of Operation
This section describes the module's operating modes.
18.2.2.1 Stop Mode
When the EWM is in stop mode, the CPU refreshes to the EWM cannot occur. On entry
to stop mode, the EWM's counter freezes.
There are two possible ways to exit from Stop mode:
• On exit from stop mode through a reset, the EWM remains disabled.
• On exit from stop mode by an interrupt, the EWM is re-enabled, and the counter
continues to be clocked from the same value prior to entry to stop mode.
Note the following if the EWM enters the stop mode during CPU refresh mechanism: At
the exit from stop mode by an interrupt, refresh mechanism state machine starts from the
previous state which means, if first refresh command is written correctly and EWM
enters the stop mode immediately, the next command has to be written within the next 15
peripheral bus clocks after exiting from stop mode. User must mask all interrupts prior to
executing EWM refresh instructions.
18.2.2.2 Debug Mode
Entry to debug mode has no effect on the EWM.
• If the EWM is enabled prior to entry of debug mode, it remains enabled.
• If the EWM is disabled prior to entry of debug mode, it remains disabled.
Chapter 18 External Watchdog Monitor (EWM)
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
NXP Semiconductors
419
Summary of Contents for MWCT101 S Series
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Page 50: ...Conventions MWCT101xS Series Reference Manual Rev 3 07 2019 50 NXP Semiconductors...
Page 70: ...Aliased bit band regions MWCT101xS Series Reference Manual Rev 3 07 2019 70 NXP Semiconductors...
Page 78: ...Pinout diagrams MWCT101xS Series Reference Manual Rev 3 07 2019 78 NXP Semiconductors...
Page 96: ...WCT101xS safety concept MWCT101xS Series Reference Manual Rev 3 07 2019 96 NXP Semiconductors...
Page 130: ...Functional description MWCT101xS Series Reference Manual Rev 3 07 2019 130 NXP Semiconductors...
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Page 472: ...Application Information MWCT101xS Series Reference Manual Rev 3 07 2019 472 NXP Semiconductors...
Page 528: ...Module clocks MWCT101xS Series Reference Manual Rev 3 07 2019 528 NXP Semiconductors...
Page 634: ...SRAM configuration MWCT101xS Series Reference Manual Rev 3 07 2019 634 NXP Semiconductors...
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Page 992: ...ADC calibration scheme MWCT101xS Series Reference Manual Rev 3 07 2019 992 NXP Semiconductors...
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Page 1726: ...Debug and security MWCT101xS Series Reference Manual Rev 3 07 2019 1726 NXP Semiconductors...
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