NXP Semiconductors Freescale Flexis MCF51MM256 User manual

TOWER SYSTEMLab Tutorial for MCF51MM256
MCF51MM256
Low power demo and
measurement engine demo
LAB
3

TOWER SYSTEMTOWER SYSTEM
BDM Interface
for MCF51MM256
(Optional)
RS232 Connector
Test Point TP8 and
TP9 are Referenced
to Ground
Flexis MM 12-Bit
DAC Output
4x Flexis MM
Differential ADC
Channels at Test
Point TP2 to TP6
Mini-USB OSBDM
Secondary Connector
Flexis MM OPAMP
Access Points
J11, Current
Measurement
16 MHz Crystal
for Flexis MM XOSC2
MCF51MM256
32.768 kHz Crystal for
Flexis MM XOSC1
Primary
Connector
Potentiometer
LED1-LED4
Infrared LED
Phototransistor
User Buttons
and RESET
SW2
SW4
SW1 = RESET
Connector to
MED-EKG Module
(Interface to MM
DAC, TRIAMPs,
OPAMPs and
ADC Pins)
Accelerometer
MMA7361L 3-Axis
Figure 1: TWR-MCF51MM Module
TWR-MCF51MM-KIT
Freescale Tower System
The TWR-MCF51MM module is part of the Freescale Tower System,
a modular development platform that enables rapid prototyping and tool
re-use through reconfigurable hardware. Take your design to the next
level and begin constructing your Tower System today.
Get to Know the TWR-MCF51MM-KIT

TOWER SYSTEMLab Tutorial for MCF51MM256
This lab is a step-by-step guide to running the Flexis MCF51MM256
low-power and on-chip measurement engine demos. Demos 1 through 4
demonstrate two of the lowest power modes, Stop 2 and Stop 3, and the
effect of current adder when used with the external clock for time tracking
applications. Demos 5 through 7 demonstrate the integrated 16-bit ADC,
12-bit DAC, OPAMP analog peripherals and the use of the programmable
delay block (PDB) for measurement synchronizations.
Introduction
Required Material
•TowerSystem—BuiltaccordingtoTWR-
MCF51MM KIT Quick Start Guide
•Twomini-USBcables—OneforTWR-
SER and one for TWR-MCF51MM
•Multimeter(notprovided)—Youcanstill
run part of this lab if you do not have
this
•Ocilloscope—Optional
•LAB3.zip—Locatedinthe“Software”
tab,underthe“Labs”sectionon
the DVD. Follow the lab guide for
installation
•Computerinstalledwith:
CodeWarriorforMicrocontrollersv6.3
MCF51MM256 service pack
P&E Embedded Multilink toolkit —
Installthisfromthe“Software”tab,
“DevelopmentTools”sectionontheDVD
The lab demonstrates
•Projectbuild,downloadandrunwith
CodeWarrior IDE
•Usingmultimetertomeasurelow-power
mode current
•UsingSerialGrapherUtilitytooltodisplay
measurement results and waveforms
•CDCclassapplicationusingFreescale’s
USBstack
The following lab assumes the user has loaded the DVD at f:\
and has extracted all zipped files under working folder d:\work.
Please replace the path if your environment is different.

TOWER SYSTEM
Configuring the Hardware
1. Assemble the Tower System and configure
jumpers to default settings as shown in
Step 2 of the Quick Start Guide (QSG). The
TWR-MCF51MM module can be placed
into any of the elevator levels, but it is
recommended to put it on the top level of
the Tower System for easy access to LEDs
and switches.
2. Make sure jumper J16 on TWR-SER has
pins 3 and 4 connected as shown in Figure
2 of the QSG.
3. Change jumper J10 on TWR-MCF51MM
from the default setting to open (no jumper
on J10).
4. If you have a multimeter, connect a
multimeter in between J11. Make sure
the meter is set to measure current: plus
probe connects to pin 1 of J11 and minus
probe connects to pin 2. If you do not
have a multimeter, make sure jumper
J11 is installed. You can still exercise the
Measurement Engine Demo portion of
this lab.
Connecting to the Computer
5. Make connections from the Tower System
to the computer in the following order:
a) Connect TWR-SER USB port to a USB
port from the PC.
b) Connect TWR-MCF51MM USB port to
another USB port from the PC.
6. If this is the first time you are connecting
the TWR-MCF51MM USB cable to your
PC, Windows will install the OSBDM driver
for the debugger. Follow the prompts
to automatically detect and install the
driver. If Windows cannot locate the
driver automatically, please specify the
following path: C:\Program Files\Freescale\
CodeWarrior for Microcontrollers V6.3\
Drivers\Osbdm-jm60.
Step-by-Step Guide
LAB
3

TOWER SYSTEMLab Tutorial for MCF51MM256
Programming the
MCF51MM256
7. Make sure all of the necessary software
mentioned in the Required Material section
above are installed on your PC.
8. Open CodeWarrior for Microcontrollers
v6.3. Use the Windows Start Menu >
All Programs > Freescale CodeWarrior
> CodeWarrior Development Studio for
Microcontrollers V6.3 > CodeWarrior IDE.
NOTE: It is important to open the correct
CodeWarrior product and version. Multiple
CodeWarrior programs can be installed on the same
computer.
9. In the CodeWarrior menu, select File
> Open. Then browse to the following
path and file: d:\work\LAB3\app\
cdc\codewarrior\cfv1usbmm256\
cfv1usbmm256.mcp.
10. In CodeWarrior, click on the Debug
icon on the project panel toolbar to
download the code to the internal flash of
MCF51MM256. Click OK to the warning
message: “loading a new application will
stop the execution of the current one.” This
will start the erasing and programming
process and will show the debugger
window when finished.
11. Close the debugger window and press
the RESET button (SW1) on the TWR-
MCF51MM. Windows will detect a new CDC
device named “Virtual COM port.” Please
select “install from a specific location
(Advanced)” and choose the path d:\work\
LAB3\app\cdc\inf for finding the driver
setup file. A Windows message may pop
up. Click “Continue Anyway” to finish the
installation.
12. After CDC driver installation, you need to
find the exact COM port Windows assigned
to the CDC device in device manager. To
access device manager, right click the My
Computer icon from your Windows desktop,
then select Manage. See the COM number
as indicated in Figure 1.
Figure 1: COM port assignment for USB CDC device in
device manager window

TOWER SYSTEM
NOTE:DifferentPCsmayhaveadifferentCOM
numberassignedtoVirtualComPort.ACOM
number larger than 8 is not supported by the Serial
PortGraphingUtilityusedinthislab.Ifthishappens,
rightclickontheVirtualComPort(COM#)>
Properties>choosetabPortSettings>Advanced…
>Selectbetween1and8fromCOMPortNumber.If
COM1to8areall“inuse,”youcanstillselectthat
as long as it does not conflict with another device.
AfterassigningaCOMnumberunplugandplug
backintheUSBfromTWR-SER.Youwillthensee
thenewCOMnumberassignedtoVirtualComPort.
AlsotryswitchingtoanotherUSBportfromyourPC.
13. Run Start menu > Programs > P&E
Embedded Multilink Toolkit > Utilities >
Serial Grapher Utility. Choose the same
COM port number found in device manager,
set baud rate to 115200 and click “open
serial port and start demo.” If you do not
see a list of options in the terminal window
as shown in Figure 2, press the Space key
from your keyboard multiple times until
you see the option menu from the terminal
window.
Figure 2: Low power and measurement engine demo

TOWER SYSTEMLab Tutorial for MCF51MM256
Running the Low Power Demo
14. Demos 1 to 4 are low power demos. The
following steps are for Demo 1. Demos 2
to 4 are similar. Ensure Demo 2 to Demo 4
follow similar steps below:
 • Tomeasurecurrent:
Press “1” in terminal window to run
Demo 1. In Demo 1, MCF51MM256
enters stop2 mode (see Figure 3),
which is lowest power mode.
You may need to adjust your
multimeter setting for lower current
reading scale.
 • Toexitstop2mode:
If you decreased the multimeter
current reading scale to measure
Stop2 current, return your multimeter
back to the higher current scale
setting to allow enough current flow
for run mode after recovering from
Stop2 mode.
Click “Close port” in Serial Grapher
tool.
Press the RESET button from TWR-
MCF51MM.
Click “Open Serial Port and Start
Demo” and wait for the message:
“STOP2 RECOVERY DETECTED.”
Keep pressing the Space key until you
return to the option menu for the next
demo.
Figure 3: Stop2 mode message
Note: Note:TheMCUwillnotentertruestopmodes
if it is in debug mode, and you may see a higher
current. To exit the debug mode, please close the
debuggerwindowandpressRESET(SW1)fromthe
TWR-MCF51MM.
Tip: When developing low power applications for
the MCF51MM series, make sure unused pins
are configured to a static state to avoid excessive
current draw due to floating pins. Please refer to the
init_boardroutineinthemain.cfilefromtheLAB3.
zipproject.

TOWER SYSTEM
Running the
Measurement Engine Demo
15. Press “5” in the terminal window to start
the ADC demonstration. The DAC module
is used to create a signal which is then
measured by the ADC. In this demo, you
can see the offset error between the DAC
output and the ADC (see Figure 4). To stop
the demo, press the SW4 button a few
times from TWR-MCF51MM until you see
“IRQ INTERRUPT PRESS SPACE.” Then
press the Space key to return to the option
menu.
Figure 4: ADC demonstration
16. Press “6” in the terminal window to show
the measurement engine functionality. The
DAC module is used to output 16 points per
period sine wave which is then measured
by the 16-bit ADC. The red waveform is
the data that is sent to the DAC (translated
to 16-bit values). The green waveform is
the data measured by the ADC. A 20 kHz
waveform is generated by the DAC and
16-bit ADC readings are taken during each
period. Press SW4 a few times to exit this
mode and press the Space key to return to
the option menu (see Figure 5).
Figure 5: Measurement engine waveform 1

TOWER SYSTEMLab Tutorial for MCF51MM256
17. Press “7” to run Demo 7. Demo 7 shows
one of the programmable gain features
from Flexis MM on-chip operational
amplifier (OPAMP). The DAC output
is amplified by the OPAMP module’s
programmable gain (gain set to 4.5). This
output is measured by the 16-bit ADC. In
Figure 6, the red waveform is the data that
is sent to the DAC (translated to 16-bit
values). The green waveform is the data
measured by the ADC. A 20 kHz waveform
is generated by the DAC and 16-bit ADC
readings are taken during each period.
On the TWR-MCF51MM module, the DAC
output can be measured at jumper J5 (pin
2). The Op-Amp output can be measured
at the header J27 (pin 9). Press SW4 a few
times to exit this mode (see Figure 6). Note:
For each probe, adjust your oscilloscope
voltage per division to about 100 mV and
time per division to 40 us scale and set the
probes to the AC coupling setting.
Figure 6: Measurement engine waveform 2

TOWER SYSTEMTOWER SYSTEM
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DocNumber:MCF51MM256LAB3/REV0
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