Information

Table 2-8. Timer modules (continued)
Module Description
Low-power timer (LPTimer) • Selectable clock for prescaler/glitch filter of 1 kHz (internal LPO), 32.768 kHz
(external crystal), or internal reference clock
• Configurable Glitch Filter or Prescaler with 16-bit counter
• 16-bit time or pulse counter with compare
• Interrupt generated on Timer Compare
• Hardware trigger generated on Timer Compare
Carrier modulator timer (CMT) • Four CMT modes of operation:
• Time with independent control of high and low times
• Baseband
• Frequency shift key (FSK)
• Direct software control of CMT_IRO pin
• Extended space operation in time, baseband, and FSK modes
• Selectable input clock divider
• Interrupt on end of cycle with the ability to disable CMT_IRO pin and use as
timer interrupt
• DMA support
Real-time clock (RTC) • Independent power supply, POR, and 32 kHz Crystal Oscillator
• 32-bit seconds counter with 32-bit Alarm
• 16-bit Prescaler with compensation that can correct errors between 0.12 ppm
and 3906 ppm
2.2.8 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 Device Charger Detect (USBDCD) The USBDCD monitors the USB data lines to detect a smart charger meeting the
USB Battery Charging Specification Rev1.1. This information allows the MCU to
better manage the battery charging IC in a portable device.
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.
Controller Area Network (CAN) Supports the full implementation of the CAN Specification Version 2.0, Part B
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)
Asynchronous serial bus communication interface with programmable 8- or 9-bit
data format and support of CEA709.1-B (LON), ISO 7816 smart card interface
I2S The I
2
S is a full-duplex, serial port that allows the chip to communicate with a
variety of serial devices, such as standard codecs, digital signal processors
(DSPs), microprocessors, peripherals, and audio codecs that implement the inter-
IC sound bus (I
2
S) and the Intel
®
AC97 standards
Chapter 2 Introduction
K20 Sub-Family Reference Manual, Rev. 1.1, Dec 2012
Freescale Semiconductor, Inc.
Preliminary
59
General Business Information