Table 2-8. Timer modules
Module Description
Timer/PWM module (TPM) • Selectable TPM clock mode
• Prescaler divide-by 1, 2, 4, 8, 16, 32, 64, or 128
• 16-bit free-running counter or modulo counter with counting be up or up-
down
• Six configurable channels for input capture, output compare, or edge-aligned
PWM mode
• Support the generation of an interrupt and/or DMA request per channel
• Support the generation of an interrupt and/or DMA request when the counter
overflows
• Support selectable trigger input to optionally reset or cause the counter to
start incrementing.
• Support the generation of hardware triggers when the counter overflows and
per channel
Periodic interrupt timers (PIT) • One general purpose interrupt timer
• Interrupt timers for triggering ADC conversions
• 32-bit counter resolution
• Clocked by bus clock frequency
• DMA support
Low power timer (LPTMR) • 16-bit time counter or pulse counter with compare
• Configurable clock source for prescaler/glitch filter
• Configurable input source for pulse counter
Real-time counter (RTC) • 16-bit up-counter
• 16-bit modulo match limit
• Software controllable periodic interrupt on match
• Software selectable clock sources for input to prescaler with programmable
16-bit prescaler
• XOSC 32.678 kHz nominal
• LPO (~1 kHz)
• External RTC_CLKIN
2.4.8 Communication interfaces
The following communication interfaces are available on this device:
Table 2-9. Communication modules
Module Description
USB OTG (low-/full-speed) USB 2.0 compliant module with support for host, device, and On-The-Go modes.
Includes an on-chip transceiver for full and low speeds.
USB voltage regulator Up to 5 V regulator input typically provided by USB VBUS power with 3.3 V
regulated output that powers on-chip USB subsystem, capable of sourcing 120 mA
to external board components.
Serial peripheral interface (SPI) Synchronous serial bus for communication to an external device
Inter-integrated circuit (I2C) Allows communication between a number of devices. Also supports the System
Management Bus (SMBus) Specification, version 2.
Universal asynchronous receiver/
transmitters (UART)
One low power UART module that retains functional in stop modes. Two UART
modules.
Chapter 2 Introduction
KL25 Sub-Family Reference Manual, Rev. 3, September 2012
Freescale Semiconductor, Inc. 43
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