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FRDM-KL27Z hardware description
5.6
Serial port
The serial port interface signals used with OpenSDA are LPUART0 pin PTA1 (TXD) and PTA2 (RXD).
These signals are also connected to I/O header J1.
5.7
Reset
The RESET signal on the KL27Z is connected externally to a pushbutton, SW2. 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 J13. Refer to
and debug adapter
(OpenSDA)" for more details.
5.8
Debug
The sole debug interface on all Kinetis L series devices is a Serial Wire Debug (SWD) port. The primary
controller of this interface on the FRDM-KL27Z is the onboard OpenSDA circuit. However, a 2x5-pin
(0.05") Cortex Debug connector, J11, provides access to the SWD signals for the KL27Z MCU.
shows SWD connector signals description for KL27Z.
5.9
Capacitive touch slider
Two GPIO pins functioning as Touch Sense Input (TSI) signals, are connected to capacitive electrodes
configured as a touch slider as shown in
8
Table 3. ARM JTAG/SWD mini connector description
Pin
Function
1
VTref
2
SWDIO/TMS
3
GND
4
SWDCLK/TCK
5
GND
6
SWO/TDO
7
NC
8
TDI
9
NC
10
RESET
Figure
5.
FRDMKL27Z User's Guide, Rev. 0, 02/2015
Connection to KL27Z
P3V3_MCU
PTA3
GND
PTA0
GND
NC
NC
NC
NC
PTA20
Freescale Semiconductor, Inc.
Section 5.2, "Serial
Table 3
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