NXP Semiconductors Freescale Flexis MCF51MM256 Manuel utilisateur

TOWER SYSTEMLab Tutorial for MCF51MM256

MCF51MM256

Low power demo and

measurement engine demo

LAB

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

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

To learn more about the TWR-MCF51MM-KIT and other Freescale medical products, please

visit freescale.com/mcf51mm,freescale.com/medical and freescale.com/tower.

Freescale, the Freescale logo and CodeWarrior are trademarks of

FreescaleSemiconductor,Inc.,Reg.U.S.Pat.&Tm.Off.Flexisisa

trademarkofFreescaleSemiconductor,Inc.Allotherproductor

service names are the property of their respective owners.

DocNumber:MCF51MM256LAB3/REV0

Information in this document is provided solely to enable system and software implementers to use Freescale Semiconductor

products. There are no express or implied copyright licenses granted hereunder to design or fabricate any integrated circuits or

integrated circuits based on the information in this document.

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