Information

Table 2-8. Timer modules (continued)

Module Description

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

2.4.8 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 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.

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

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

S) and the Intel

AC97 standards

2.4.9 Human-machine interfaces

The following human-machine interfaces (HMI) are available on this device:

Module Functional Categories

K20 Sub-Family Reference Manual, Rev. 2, Feb 2012

56 Freescale Semiconductor, Inc.