Information

Chapter 39
Low power timer (LPTMR)
39.1 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.
39.1.1 Features
The LPTMR module's features 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
39.1.2 Modes of operation
39.1.2.1 Run mode
In run mode, the LPTMR operates normally.
K20 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc. 993