Information

Chapter 37
Low-Power Timer (LPTMR)
37.1 Introduction
NOTE
For the chip-specific implementation details of this module's
instances see the chip configuration chapter.
The low-power timer (LPTMR) can be configured to operate as a time counter with
optional prescaler, or as a pulse counter with optional glitch filter, across all power
modes, including the low-leakage modes. It can also continue operating through most
system reset events, allowing it to be used as a time of day counter.
37.1.1 Features
The features of the LPTMR module include:
• 16-bit time counter or pulse counter with compare
• Optional interrupt can generate asynchronous wakeup from any low-power mode
• Hardware trigger output
• Counter supports free-running mode or reset on compare
• Configurable clock source for prescaler/glitch filter
• Configurable input source for pulse counter
• Rising-edge or falling-edge
37.1.2 Modes of operation
The following table describes the operation of the LPTMR module in various modes.
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
Freescale Semiconductor, Inc. 829