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The EWM_OUT_b signal is asserted in any of the following conditions:
• The EWM refresh occurs when the counter value is less than CMPL value.
• The EWM counter value reaches the CMPH value, and no EWM refresh has
occurred.
• If functionality of EWM_in pin is enabled and EWM_in pin is asserted while
refreshing the EWM.
• After any reset (by the virtue of the external pull-down mechanism on the
EWM_OUT_b pin)
The EWM_OUT_b is asserted after any reset by the virtue of the external pull-down
mechanism on the EWM_OUT_b signal. Then, to deassert the EWM_OUT_b signal, set
EWMEN bit in the CTRL register to enable the EWM.
If the EWM_OUT_b signal shares its pad with a digital I/O pin, on reset this actual pad
defers to being an input signal. The pad state is controlled by the EWM_OUT_b signal
only after the EWM is enabled by the EWMEN bit in the CTRL register.
Note
EWM_OUT_b pad must be in pull down state when EWM
functionality is used and when EWM is under Reset.
18.5.2 EWM_OUT_b pin state in low power modes
During Wait, Stop, and Power Down modes the EWM_OUT_b pin preserve its state
before entering Wait or Stop mode. When the CPU enters a Run mode from Wait or Stop
recovery, the pin resumes its previous state before entering Wait or Stop mode. When the
CPU enters Run mode from Power Down, the pin returns to its reset state.
18.5.3 The EWM_in Signal
The EWM_in is a digital input signal for safety status of external safety circuits, that
allows an external circuit to control the assertion of the EWM_OUT_b signal. For
example, in the application, an external circuit monitors a critical safety function, and if
there is fault with safety function, the external circuit can then actively initiate the
EWM_OUT_b signal that controls the gating circuit.
The EWM_in signal is ignored if the EWM is disabled, or if INEN bit of CTRL register
is cleared, as after any reset.
Chapter 18 External Watchdog Monitor (EWM)
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
NXP Semiconductors
427
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...
Page 284: ...Functional description MWCT101xS Series Reference Manual Rev 3 07 2019 284 NXP Semiconductors...
Page 430: ...Functional Description MWCT101xS Series Reference Manual Rev 3 07 2019 430 NXP Semiconductors...
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...
Page 818: ...Functional description MWCT101xS Series Reference Manual Rev 3 07 2019 818 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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