Datasheet

• Selectable clock for prescaler/glitch filter

• 1 kHz internal LPO

• External low power crystal oscillator

• Internal reference clock (not available in low leakage power modes)

• Secondary external reference clock (for example, 32 kHz crystal)

• Configurable glitch filter or prescaler

• Interrupt generated on timer compare

• Hardware trigger generated on timer compare

4.5.6.5 Carrier Modulator Timer (CMT)

• Four modes of operation

• Time with independent control of high and low times

• Baseband

• Frequency shift key (FSK)

• Direct software control of CMT_IRO signal

• Extended space operation in time, baseband, and FSK modes

• Selectable input clock divider

• Interrupt on end of cycle

• Ability to disable CMT_IRO signal and use as timer interrupt

4.5.6.6 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

• Register write protection

• Hard Lock requires VBAT POR to enable write access

• Soft lock requires system reset to enable write/read access

Communication interfaces

4.5.7.1 USB On-The-Go Module (FS/LS)

• Complies with USB specification rev 2.0

• USB host mode

• Supports enhanced-host-controller interface (EHCI)

• Allows direct connection of FS/LS devices without an OHCI/UHCI companion controller

• Supported by Linux and other commercially available operating systems

• USB device mode

• Full-speed operation via the on-chip transceiver

• Supports one upstream facing port

• Supports four programmable, bidirectional USB endpoints, including endpoint 0

• Suspend mode/low power

• As host, firmware can suspend individual devices or the entire USB and disable chip clocks for low-power

operation

• Device supports low-power suspend

• Remote wake-up supported for host and device

• Integrated with the processor’s low power modes

• Includes an on-chip full-speed (12 Mbps) and low-speed (1.5 Mbps) transceiver

4.5.7

Communication interfaces

K20 Family Product Brief, Rev. 11, 08/2012

42 Freescale Semiconductor, Inc.