Datasheet

FRDM-KE02Z40M User’s Guide, Rev. 0, 03/2014
8 Freescale Semiconductor, Inc.
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Figure 4. SWD debug connector to KE02Z
4.2.2 Virtual serial port
A serial port connection is available between the OpenSDA MCU and UART1 pin PTC7 (TXD1) and
PTC6 (RXD1) of KE02Z. 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 KE02Z.
4.3 KE02Z microcontroller
4.4 Clock source
The Kinetis KE02 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 KE02Z64 on the FRDM-KE02Z40M is clocked from a 10 MHz crystal.
4.4.1 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.
4.4.2 Reset
The PTA5/RESET signal on the KE02Z 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. Please refer to the
Serial and Debug Adapter section for more details.
4.4.3 Debug
The sole debug interface on all Kinetis E Series devices is a Serial Wire Debug (SWD) port. The
primary controller of this interface on the FRDM-KE02Z40M is the onboard OpenSDA circuit.