Freescale Semiconductor TWR-K21F120M User manual

TWR-K21F120M
Quick Start Guide
Low-Power 32-bit ARM
®
Cortex
®
-M4
Core-Based MCUs with Floating Point Unit,
USB Connectivity and Enhanced Security
Tower System
Development Board
Platform

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freescale.comQuick Start Guide
TWR-K21F120M Freescale Tower System
Development Board Platform
The TWR-K21F120M board is designed to work either in standalone
mode or as part of the Freescale Tower System, a modular development
board platform that enables rapid prototyping and tool re-use through
reconfigurable hardware. Begin constructing your Tower System evaluation
board platform today by visiting freescale.com/Tower for additional Tower
System boards and compatible peripherals.
Get to Know the TWR-K21F120M Board
Power/OSJTAG
Micro-USB
Regulator
Option
Selector
RESET
K21 USB
Micro OTG
Tamper Pins USB Option Selector
SW2
SW3
Accelerometer
LEDs
Potentiometer
General-
Purpose
TWRPI Plug-In
JM60 Bootloader Selection
JM60 BDMVBAT Options
K21 Cortex Debug
Figure 1: Front side of TWR-K21F120M
Battery
Receptacle
SD Card
Receptacle

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Download Software
and Tools
Download installation
software and documentation
under “Jump Start
Your Design” at
freescale.com/TWR-K21F120M.
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freescale.comQuick Start Guide
Step-by-Step
Installation Instructions
TWR-K21F120M
Features
• MK21FN1M0VMC12 MCU (120 MHz,
1 MB flash, 128 KB RAM, FPU, USB
OTG, tamper detection,
encryption, low power, 121 MBGA)
• Dual-role USB interface with Micro-AB
USB connector
• Onboard open source JTAG (OSJTAG)
circuit with virtual serial port
• General-purpose Tower plug-in (TWRPI)
socket
• Three-axis accelerometer (MMA8451Q)
• Four user-controlled status LEDs
• Pushbuttons for GPIO interrupts and
MCU reset
• Potentiometer, SD card socket and coin
cell battery holder
• Independent, battery-operated power
supply for real-time clock and tamper
detection modules
In this Quick Start Guide, you will learn
how to set up the TWR-K21F120M board
and run the included demonstration
software. For more detailed information,
review the user manual at freescale.com/
TWR-K21F120M.
2Install the
Software and Tools
Install the P&E Micro Kinetis Tower toolkit.
The toolkit includes the OSJTAG and USB
to serial drivers.
3Configure the
Hardware
Install the included battery into the battery
receptacle to power the RTC. Then
use the provided USB cable to connect
the PC to the Power/OSJTAG USB
Micro-B connector (J2). Allow the PC to
automatically configure the USB drivers
if needed.
4Tilt the
Board
Tilt the board side to side to see the LEDs
on D5, D6, D8 and D9 light up as it is
tilted. While the board is held flat, press
SW2 and SW3 to toggle LEDs D5 and D9,
respectively.
5Download the Freescale
CodeWarrior IDE and
MQX™RTOS
Download the Freescale CodeWarrior IDE
and MQX RTOS by clicking the relevant
links at freescale.com/CodeWarrior and
freescale.com/MQX.

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freescale.comQuick Start Guide
TWR-K21F120M Jumper Options
The following is a list of all jumper options on the TWR-K21F120M. The default installed
jumper settings are indicated in the shaded boxes.
Jumper Option Setting Description
J6
JTAG Board
Power
Selection
ON
Connect OSJTAG 5 V output (P5V_TRG_USB) to JTAG port
(supports powering board from JTAG pod supporting 5 V supply
output)
OFF Disconnect OSJTAG 5 V output (P5V_TRG_USB) from JTAG port
J7 VBAT Power
Source
1-2 Connect VBAT to onboard 3.3 V or 1.8 V supply
2-3 Connect VBAT to the higher voltage between MCU supply (MCU_
PWR) or coin cell supply (VBATD)
J8 MCU Power
Connection
1-2 Connect onboard 3.3 V or 1.8 V supply (V_BRD) to MCU VDD
2-3 Connect K21 USB regulator output to MCU VDD
J9
OSJTAG
Bootloader
Selection
ON OSJTAG bootloader mode (OSJTAG firmware reprogramming)
OFF Debugger mode
J10
General-
Purpose
TWRPI
V_BRD
Power Enable
ON Connect onboard 1.8 V or 3.3 V supply (V_BRD) to
TWRPI 3 V power (GPT_VBRD)
OFF Disconnect from-board 1.8 V or 3.3 V supply (V_BRD) to
TWRPI 3 V power (GPT_VBRD)
J11 VREG IN
Selector
1-2 OSJTAG 5 V output (P5V_TRG_USB)
connected to onboard regulator input (VREG_IN)
5-6 VBUS signal on micro-USB connector J19 connects to
K21_VREGIN to allow standalone USB operation
6-8 VBUS signal from Tower elevator connector connects to
K21_VREGIN to allow USB operation with complete Tower System
J12 Potentiometer
Connection
ON Connect potentiometer to ADC0_SE12
OFF Disconnect potentiometer from ADC0_SE12
J13
GPIO
RESET_OUT_B
connection
1-2 Connect PTA14 to RESET_OUT_B signal
2-3 Connect PTA17 to RESET_OUT_B signal
OFF Leave RESET_OUT_B signal disconnected
Jumper Option Setting Description
J15 LED
Connections
1-2 Connect PTD4 to green LED (D5)
3-4 Connect PTD5 to yellow LED (D6)
5-6 Connect PTD6 to red LED (D8)
7-8 Connect PTD7 to blue LED (D9)
OFF Disconnect PTD[4:7] from associated LED
J16 SDHC Card
OFF 10K pulldown resistor is disconnected from CD/DATA3 line
ON 10K pulldown resistor is connected to CD/DATA3 line to allow card
detection
J17
V_BRD Power
Source
(Board Power
Selector)
1-2 Connect K21 USB regulator output (VOUT_3V3) to
onboard supply (V_BRD)
3-5 Connect 3.3 V onboard regulator output (P3V3) to
onboard supply (V_BRD)
5-7 Connect 1.8 V onboard regulator output (P1V8) to
onboard supply (V_BRD)
J18
Accelerometer
IRQ
Connection
1-2 Connect PTB0 to INT1 pin of accelerometer
3-4 Connect PTB1to INT2 pin of accelerometer
OFF Disconnect PTB0 and/or PTB1 from INT1 and/or INT2 of
accelerometer
J21 USB ID
Connection
ON Connect PTD7 to USB ID pin
OFF Disconnect PTD7 from USB ID pin
J22 USB Power
Enable
ON Connect PTC9 to USB power enable on power switch MIC2026
OFF Disconnect PTC9 from USB power enable on power switch
MIC2026
J23 USB Over-
Current Flag
ON Connect PTC8 to overcurrent flag on power switch MIC2026
OFF Disconnect PTC8 from overcurrent flag on power switch MIC2026
J24 USB
Connection
1-2 USB micro J19
2-3 USB mini J14 on TWR-SER
JP1 Tamper
Connections 2-3 JP1-1 through JP1-6 are connected to the MCU Tamper pins TAMPER0 through TAMPER5, respectively

For more information, visit freescale.com/Tower
Join the online Tower community at towergeeks.org
Freescale, the Freescale logo, CodeWarrior and Kinetis are trademarks of
Freescale Semiconductor, Inc., Reg. U.S. Pat. & Tm. Off. Tower is a trademark
of Freescale Semiconductor, Inc. All other product or service names are the
property of their respective owners. ARM and Cortex are registered
trademarks of ARM Limited (or its subsidiaries) in the EU and/or elsewhere.
All rights reserved. © 2013, 2014 Freescale Semiconductor, Inc.
Doc Number: TWRK21F120MQSG REV 3 Agile Number: 926-27946 Rev D
Visit freescale.com/TWR-K21F120M,
freescale.com/K20 or freescale.com/Kinetis
for more information on the TWR-K21F board.
Support
Visit freescale.com/support for a list of phone
numbers within your region.
Warranty
Visit freescale.com/warranty for complete
warranty information.
Get Started
Download installation software and documentation under
“Jump Start Your Design” at freescale.com/TWR-K21F120M.