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30.4.5 LPTMR counter
The CNR increments by one on every:
• Prescaler clock in Time Counter mode with prescaler bypassed
• Prescaler output in Time Counter mode with prescaler enabled
• Input source assertion in Pulse Counter mode with glitch filter bypassed
• Glitch filter output in Pulse Counter mode with glitch filter enabled
The CNR is reset when the LPTMR is disabled or if the counter register overflows. If
CSR[TFC] is cleared, then the CNR is also reset whenever CSR[TCF] is set.
When the core is halted in Debug mode:
• If configured for Pulse Counter mode, the CNR continues incrementing.
• If configured for Time Counter mode, the CNR stops incrementing.
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.
30.4.6 LPTMR hardware trigger
The LPTMR hardware trigger asserts at the same time the CSR[TCF] is set and can be
used to trigger hardware events in other peripherals without software intervention. The
hardware trigger is always enabled.
When
Then
The CMR is set to 0 with CSR[TFC] clear
The LPTMR hardware trigger will assert on the first compare
and does not deassert.
The CMR is set to a nonzero value, or, if CSR[TFC] is set
The LPTMR hardware trigger will assert on each compare
and deassert on the following increment of the CNR.
30.4.7 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.
Functional description
K32 L2A Reference Manual, Rev. 2, 01/2020
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NXP Semiconductors
Содержание K32 L2A Series
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