Freescale Semiconductor Evaluation, Demonstration and Development Board for MCF51MM257 TWR-MCF51MM-KIT TWR-MCF51MM-KIT User Manual
Product codes
TWR-MCF51MM-KIT
TWR-MCF51MM User Manual
Page 4 of 12
2 Reference Documents
latest revision of all Tower System documentation.
TWR-MCF51MM Schematics
TWR-MCF51MM Quick Start Guide
TWR-MCF51MM-KIT Lab Tutorial
MCF51MM256 Reference Manual
MCF51MM256 Data Sheet
AN3561, USB Bootloader for the MC9S08JM60
3 Hardware Features
This section provides more details about the features and functionality of the TWR-MCF51MM.
3.1
Clocking
Two crystals are provided on the board for clocking the MCF51MM256 device:
1. A 16 MHz crystal connected to XTAL2 and EXTAL2 for system clocking
2. A 32.768kHz crystal connected to XTAL1 and EXTAL1 for TOD usage
2. A 32.768kHz crystal connected to XTAL1 and EXTAL1 for TOD usage
3.2
System Power
The TWR-MCF51MM can be powered by the Open Source BDM (OSBDM) circuit via the Mini-B USB
connector when stand-alone. When assembled with the Tower System and the TWR-SER is configured
to run USB device mode (J16 pin 3 and 4 connected), the Mini-B USB connector is no longer used as a
power source and only used for OSBDM debugging purposes. In this case, the power will be supplied
from the Mini-B USB from the TWR-SER. Please plug in the Mini-B USB connector from TWE-SER before
plugging in the Mini-B USB connector from TWR-MCF51MM.
A standard USB A male to Mini-B male cable (provided) can be used to supply power from a USB host
or powered USB hub. Optionally, an AC to DC adapter with a USB A female receptacle (not provided)
can be used as the power source.
A jumper, J11, can be used to isolate the 3.3V supply from the microcontroller. This connection can be
used to measure the power usage of the MCF51MM256 microcontroller.
connector when stand-alone. When assembled with the Tower System and the TWR-SER is configured
to run USB device mode (J16 pin 3 and 4 connected), the Mini-B USB connector is no longer used as a
power source and only used for OSBDM debugging purposes. In this case, the power will be supplied
from the Mini-B USB from the TWR-SER. Please plug in the Mini-B USB connector from TWE-SER before
plugging in the Mini-B USB connector from TWR-MCF51MM.
A standard USB A male to Mini-B male cable (provided) can be used to supply power from a USB host
or powered USB hub. Optionally, an AC to DC adapter with a USB A female receptacle (not provided)
can be used as the power source.
A jumper, J11, can be used to isolate the 3.3V supply from the microcontroller. This connection can be
used to measure the power usage of the MCF51MM256 microcontroller.
3.3
Debug Interface
An on-board, MC9S08JM60 based OSBDM circuit provides a debug interface to the MCF51MM256. A
standard USB A male to Mini-B male cable (provided) can be used for debugging via the USB connector,
J17. Refer to Section 6 for information on other modes of operation of the OSBDM.
standard USB A male to Mini-B male cable (provided) can be used for debugging via the USB connector,
J17. Refer to Section 6 for information on other modes of operation of the OSBDM.