Freescale Semiconductor, Inc
FRDM-K20D50MUM
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Feature
Description
Timing and Control
-Two FlexTimers with a total of 10 channels
-Hardware dead-time insertion and quadrature decoding for motor control
-Carrier modulator timer for infrared waveform generation in remote control
applications
- Four-channel 32-bit periodic interrupt timer provides time base for RTOS task
scheduler or trigger source for ADC conversion and programmable delay block
Human-Machine
Interface
-Hardware touch-sensing interface (TSI) with up to 16 inputs
-TSI operates in low power modes (minimum current adder when enabled)
-TSI hardware implementation avoids software polling methods
-High sensitivity level allows use of overlay surfaces up to 5 mm thick.
Connectivity and
Communications
-Full-Speed USB Device/Host/On-The-Go with device charge detect capability
- Optimized charging current/time for portable USB devices, enabling longer
battery life
- USB low-voltage regulator supplies up to 120 mA off chip at 3.3 volts to power
external components from 5-volt input
-Three UARTs (one UART supports RS232 with flow control, RS485, ISO7816 and
IrDA while the other two UARTS support RS232 with flow control and RS485)
-One Inter-IC Sound (I2S) serial interface for audio system interfacing
-One DSPI module and one I2C module
Reliability, Safety and
Security
-Memory protection unit provides memory protection for all masters on the
cross bar switch, increasing software reliability
-Cyclic redundancy check (CRC) engine validates memory contents and
communication data, increasing system reliability
-Independent-clocked computer operating properly (COP) guards against clock
skew or code runaway for fail-safe applications such as the IEC 60730 safety
standard for household appliances
-External watchdog monitor drives output pin to safe state for external
components in the event that a watchdog timeout occurs
-This product is included in Freescale’s product longevity program, with assured
supply for a minimum of 10 years after launch
5.1.3
Clock source
The Kinetis K microcontrollers feature an on-chip oscillator compatible with three ranges of input crystal or
resonator frequencies: 32-40 kHz (low freq. mode), 3-8 MHz (high freq. mode, low range) and 8-32 MHz (high
freq. mode, high range). The FRDM-K20D50M is clocked from an 8 MHz crystal.