Information

2.2.4 Clocks

The following clock modules are available on this device.

Table 2-5. Clock modules

Module Description

Multi-clock generator (MCG) The MCG provides several clock sources for the MCU that include:

• Phase-locked loop (PLL) — Voltage-controlled oscillator (VCO)

• Frequency-locked loop (FLL) — Digitally-controlled oscillator (DCO)

• Internal reference clocks — Can be used as a clock source for other on-chip

peripherals

System oscillator The system oscillator, in conjunction with an external crystal or resonator,

generates a reference clock for the MCU.

Real-time clock oscillator The RTC oscillator has an independent power supply and supports a 32 kHz

crystal oscillator to feed the RTC clock. Optionally, the RTC oscillator can replace

the system oscillator as the main oscillator source.

2.2.5 Security and Integrity modules

The following security and integrity modules are available on this device:

Table 2-6. Security and integrity modules

Module Description

Cyclic Redundancy Check (CRC) Hardware CRC generator circuit using 16/32-bit shift register. Error detection for all

single, double, odd, and most multi-bit errors, programmable initial seed value, and

optional feature to transpose input data and CRC result via transpose register.

2.2.6 Analog modules

The following analog modules are available on this device:

Table 2-7. Analog modules

Module Description

16-bit analog-to-digital converters (ADC)

and programmable-gain amplifiers

(PGA)

16-bit successive-approximation ADC designed with integrated programmable gain

amplifiers (PGA)

Analog comparators Compares two analog input voltages across the full range of the supply voltage.

6-bit digital-to-analog converters (DAC) 64-tap resistor ladder network which provides a selectable voltage reference for

applications where voltage reference is needed.

12-bit digital-to-analog converters (DAC) Low-power general-purpose DAC, whose output can be placed on an external pin

or set as one of the inputs to the analog comparator or ADC.

Table continues on the next page...

Chapter 2 Introduction

K20 Sub-Family Reference Manual, Rev. 1.1, Dec 2012

Freescale Semiconductor, Inc.

Preliminary

General Business Information