Datasheet

FRDMKL25ZUM FRDM-KL05Z User's Manual Page 9 of 13
- System oscillator supporting external crystal or resonator
- Low-power 1kHz RC oscillator for RTC and COP watchdog
 Analog peripherals
- 12-bit SAR ADC w/ DMA support
- 12-bit DAC w/ DMA support
- High speed comparator
 Communication peripherals
- one 8-bit Serial Peripheral Interfaces (SPI)
- one I
2
C modules
- One low-power UART
 Timers
- One 6-channel Timer/PWM module
- one 2-channel Timer/PWM modules
- 2-channel Periodic Interrupt Timer (PIT)
- Real time clock (RTC)
- Low-power Timer (LPT)
- System tick timer
 Human-Machine Interfaces (HMI)
- General purpose input/output controller
- Capacitive touch sense input interface hardware module
5.3.1 Clock Source
The Kinetis KL0 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 KL05Z32on the FRDM-KL05Z is clocked from a 32.768 kHz
crystal.
5.3.2 Serial Port
The primary serial port interface signals are PTB1 and PTB2. These signals are connected to both the
OpenSDA and toI/O connector J8.
5.3.3 Reset
The PTA20/RESET signal on the KL05Z32 is connected to pushbutton, SW1, and to the OpenSDA circuit.
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. Please refer to section 5.2, Serial and
Debug Adapter (OpenSDA), for more details.
5.3.4 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-KL05Z is the onboard OpenSDA circuit (see section 5.2).
However, an unpopulated 10-pin (0.05”) Cortex Debug connector, J1, provides access to the SWD
signals. The Samtec FTSH-105-02-F-D or compatible connectors can be added to the J1 through-hole
debug connector to allow for an external debug cable to be connected.