NXP Semiconductors freescale KV4 Series, Reference Manual

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Chapter 42
Low-Power Timer (LPTMR)
Chip-specific LPTMR information
42.1.1 LPTMR prescaler/glitch filter clocking options
The prescaler and glitch filter of the LPTMR module can be clocked from one of four
sources determined by the LPTMR0_PSR[PCS] bitfield. The following table shows the
chip-specific clock assignments for this bitfield.
NOTE
The chosen clock must remain enabled if the LPTMR is to
continue operating in all required low-power modes.
LPTMR0_PSR[PCS] Prescaler/glitch filter clock
number
Chip clock
00 0 MCGIRCLK — internal reference clock
(not available in VLPS/VLLS modes)
01 1 LPO — 1 kHz clock (not available in
VLLS0 mode)
10 2 ERCLK32K — secondary external
reference clock
11 3 OSCERCLK_UNDIV — Undivided
external reference clock (not available in
VLLS0 mode)
See Clock Distribution for more details on these clocks.
42.1.2 LPTMR pulse counter input options
The LPTMR_CSR[TPS] bitfield configures the input source used in pulse counter mode.
The following table shows the chip-specific input assignments for this bitfield.
42.1
KV4x Reference Manual, Rev. 2, 02/2015
Freescale Semiconductor, Inc.
Preliminary
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