FRDMKE06UG, Freedom KE06 User’s Guide, Rev. 0, 03/2014
6
Freescale Semiconductor, Inc.
Serial and Debug Adapter (OpenSDA)
Figure 4. SWD debug connector to KE06
3.2
Virtual serial port
A serial port connection is available between the OpenSDA MCU and UART1 pin PTC7 (TXD1) and
PTC6 (RXD1) of KE06. Several of the default OpenSDA applications provided by Freescale, including
the MSD Flash Programmer and the P&E Debug Application, provide a USB Communications Device
Class (CDC) interface that bridges serial communications between the USB host and this serial interface
on the KE06.
3.3
KE06 microcontroller
3.3.1
Clock source
The Kinetis KE06 microcontrollers feature an on-chip oscillator compatible with two ranges of input
crystal or resonator frequencies: 32 kHz (low frequency mode), 4-20 MHz (high frequency mode).
The KE06 on the FRDM-KE06 is clocked from an 8 MHz crystal.
3.3.2
Serial port
The serial port interface signals used with OpenSDA are UART1 pin PTC7 (TXD1) and PTC6 (RXD1).
These signals are also connected to I/O header J1.
3.3.3
Reset
The PTA5/RESET signal on the KE06 is connected externally to a pushbutton SW1. The reset button can
be used to force an external reset event in the target MCU. The reset button can also be used to force the
OpenSDA circuit into bootloader mode when plugging the USB cable to J6. See
” section for more details.
