Freescale Semiconductor TWR-MCF51MM User guide

TWR-MCF51MM

User Manual

Rev. 1.0

Freescale Semiconductor Inc.

Contents

1 Overview ...................................................................................................................................................... 3

2 Reference Documents .............................................................................................................................. 4

3 Hardware Features ................................................................................................................................... 4

3.1 Clocking .................................................................................................................................................................................. 4

3.2 System Power ....................................................................................................................................................................... 4

3.3 Debug Interface ................................................................................................................................................................... 4

3.4 RS232 Interface ................................................................................................................................................................... 5

3.5 Infrared Port ......................................................................................................................................................................... 5

3.6 Medical Connector .............................................................................................................................................................. 5

3.7 Elevator Connections ........................................................................................................................................................ 6

3.8 Mechanical Form Factor .................................................................................................................................................. 8

4 Jumper Table .............................................................................................................................................. 8

5 Input/Output Connectors and Pin Usage Table........................................................................... 10

6 OSBDM ........................................................................................................................................................ 10

6.1 Bootloader Mode For MC9S08JM60......................................................................................................................... 10

7 Bootloader Mode For MCF51MM256 .............................................................................................. 11

8 BDM inteface (Optional) ...................................................................................................................... 12

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1 Overview

TWR-MCF51MM is a low-cost evaluation, demonstration and development board that features a 32-bit
MCF51MM256 microcontroller. The TWR-MCF51MM can operate stand-alone or as the main control
board in a Tower System with peripheral modules.

The following list summarizes the features of the MCF51MM Tower MCU boards:

 Tower compatible processor board
 Open Source BDM (OSBDM) circuit
 Analog measurement circuitry
 4 LEDs
 DIP Switches and push buttons for user input
 Potentiometer
 MMA7361L three-axis accelerometer
 RS232 transceiver and 2x5 pin header

Figure 1. TWR-MCF51MM Block Diagram

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2 Reference Documents

The documents listed below are available online. Refer to http://www.freescale.com/tower for the
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

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.

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.

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