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The CNR cannot be initialized, but can be read at any time. On each read of the CNR,
software must first write to the CNR with any value. This will synchronize and register
the current value of the CNR into a temporary register. The contents of the temporary
register are returned on each read of the CNR.
When reading the CNR, the bus clock must be at least two times faster than the rate at
which the LPTMR counter is incrementing, otherwise incorrect data may be returned.
43.5.5 LPTMR compare
When the CNR equals the value of the CMR and increments, the following events occur:
• CSR[TCF] is set.
• LPTMR interrupt is generated if CSR[TIE] is also set.
• LPTMR hardware trigger is generated.
• CNR is reset if CSR[TFC] is clear.
When the LPTMR is enabled, the CMR can be altered only when CSR[TCF] is set. When
updating the CMR, the CMR must be written and CSR[TCF] must be cleared before the
LPTMR counter has incremented past the new LPTMR compare value.
NOTE
When the LPTMR is enabled in Time Counter mode, the first
increment will take an additional one or two clock cycles due to
synchronization logic. This will result in the first compare (and
therefore interrupt and hardware trigger) occuring slightly later.
A faster prescaler clock or larger prescaler value will minimize
this impact.
43.5.6 LPTMR interrupt
The LPTMR interrupt is generated whenever CSR[TIE] and CSR[TCF] are set.
CSR[TCF] is cleared by disabling the LPTMR or by writing a logic 1 to it.
CSR[TIE] can be altered and CSR[TCF] can be cleared while the LPTMR is enabled.
The LPTMR interrupt is generated asynchronously to the system clock and can be used to
generate a wakeup from any low-power mode, including the low-leakage modes,
provided the LPTMR is enabled as a wakeup source.
Functional description
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
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NXP Semiconductors
Содержание MWCT101 S Series
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