NXP Semiconductors Freescale DEMOEM MCF51EM Operation instructions

32-bit Microcontrollers
DEMOEM Lab Tutorial
V1 ColdFire MCU for smart metering

Introduction
These labs highlight key features of the MCF51EM
microcontroller and are implemented as a standard
CodeWarrior project without an RTOS framework.
They are also intended to serve as software examples
of peripheral configuration and functional operation.
For code examples using the MQX RTOS, please refer
to the DEMOEM MQX Lab Tutorials document within the
documentation section of the Getting Started DVD.
Before You Begin
Complete the steps in the Quick Start Guide to install1.
CodeWarrior for Microcontrollers v6.3 Special Edition
(30-day evaluation version).
Ensure the DEMOEM board jumpers are configured in their2.
factory default positions, as described in the DEMOEM User
Manual within the documentation section of the Getting
Started DVD.
The demonstration code was programmed into the flash
memory of the MCF51EM MCU prior to shipment of the
DEMOEM kit. It should not be necessary to re-program
the device unless you have already completed the MQX
labs or have downloaded your own development code
to MCU flash.
Program the Demo Code to MCU Flash
In the event that flash has been over-written since the
arrival of your DEMOEM kit, download the project code
to the MCU as follows:
Select the ‘DEMOEM Project for CodeWarrior 6.3’ link under1.
the Software tab of the Getting Started DVD and save the
project to your hard drive.
Open CodeWarrior for Microcontrollers. From the Windows2.
Start menu, select “Programs>Freescale CodeWarrior>CW
for Microcontrollers V6.3>CodeWarrior IDE.”
Open the lab project by selecting the File>Open menu3.
option and navigating to the directory path where the
DEMOEM-CW63.mcp file was saved during Step 1.
In the project pane, select the “P&E Multilink/Cyclone Pro”4.
build target, as shown below:
Compile the project by pressing the F7 key or by5.
clicking the Make icon on the project pane.
Connect the DEMOEM board to your computer using the6.
USB cable included with the kit. Then power the board by
sliding switch K6 in the upper left corner of the board to the
left-most position. The red Power LED, the green USB LED,
and the QE8 Signal Generator LEDS should be on.
Now start the debugger by clicking the7.
Debug icon.
The P&E MCF51xx Connection Manager window will8.
now appear as shown below. Click the Connect button
and a dialog box will appear asking if you would like to
erase the flash and program it with the project code.
Select OK to proceed.
After the code has been programmed to flash, begin code9.
execution in one of several ways:
a. Press the debugger Run button.
b. Press the DEMOEM hardware Reset button.
c. Disconnect and reconnect the USB cable from the
DEMOEM board.
d. Toggle power switch K6 to power-down, then power-up
the MCU.
Once code is executing, you may close the True-Time10.
Simulator and Real-Time Debugger window.
You should now see a welcome message on the
DEMOEM LCD:
Demo Code Functional Structure
The demonstration code operates as a state machine
(see back page for program flow diagram).
Progression through the states is controlled via the
SW1 button. Once the Welcome state is exited, it is
impossible to return without a Reset/POR.
Familiarize yourself with the DEMOEM hardware and the
various user interfaces that will be used over the course
of the following lab exercises, many of which have been
labeled on the board diagram (see back page).
State
1
Measure Typical Power and
Energy Parameters of an Emulated
Three-Phase System Using the
MCF51EM ADC and PDB
This lab demonstrates the smart metering capability
of the MCF51EM microcontroller. Code configures the
ADC and uses the Programmable Delay Block (PDB)
to trigger conversions at precisely-timed intervals to
account for phase delay between voltage and current
measurements. The resulting conversions are stored to
a cyclic RAM buffer for calculation of RMS voltage (V)
and current (I), current at the fundamental frequency (IF),
power factor (PF), energy (E), active power (P), reactive
power (RP), apparent power (AP) and total harmonic
distortion (TH).
The DEMOEM 9S08QE8 signal generator circuit in the
lower right corner of the board must be configured
for normal mode operation, as indicated by one blink
every three seconds of the LED labeled “PTC2.” Use
push button SW5 to cycle the signal generator through
its operating modes until normal mode is achieved.
For more information regarding the signal generator
functionality, refer to the QE8 Signal Generator User
Manual within the documentation section of the Getting
Started DVD.
User Interface
• SW1 advances to the next state/demo.
• SW2 advances through the available measurements/
calculations as follows: RMS voltage (V) -> RMS current (I)
-> current at the fundamental frequency (IF) -> power factor
(PF) -> energy (E) -> active power (P) -> reactive power
(RP) -> apparent power (AP) -> total harmonic distortion
(TH) -> RMS voltage (V) ->
• SW3 and SW4 scroll backward and forward, respectively,
through the individual measurements/calculations:
line1<-> line2 <-> line 3 <-> total <-> line1
* Note that some parameters do not have a “total” field.
• Potentiometer W1 adjusts the amplitude of the voltage
waveforms all together (lines 1, 2, and 3 simultaneously).
• Potentiometer W2 adjusts the amplitude of the current
waveforms all together (lines 1, 2, and 3 simultaneously).
• Potentiometer W3 adjusts the phase delay between the
voltage and current waveforms.
Step by Step Instructions
Press SW1 until you see the “Measurement” state on1.
the display.
Press SW2 to enter the metering demo. RMS2. voltage for
line1 will be shown on the LCD.
Step the metering demonstration through all3. the calculated
parameters using SW2 and note the change in each
parameter as you vary the stimulus waveforms using the
signal generator’s potentiometers.
State
2
Use the IRTC Tamper Log Feature
to Track Hardware Tamper Events
The MCF51EM independent real-time clock (IRTC)
includes a feature that records the type and timestamp
when hardware tampering events, such as a change in
state of the Tamper device pin or removal of the IRTC
VBAT supply during normal operation, occur.
For this demonstration, install a CR2032 battery
(not included with the DEMOEM kit) in the appropriate
socket underneath the board to avoid continuous
tamper detection for missing VBAT source. Then install
a jumper at J37 to connect the MCU VBAT pin to the
CR2032 battery source.
User Interface
• SW1 advances to the next state/demo.
• Press (SW2 + SW3) or (SW2 + SW4) to clear the tamper log.
• SW3 and SW4 scroll backward and forward, respectively,
through the Tamper log entries recorded in MCU flash.
Step by Step Instructions
Press SW1 until you see the “Tamper Log” state on1.
the display.
Press SW2, SW3 or SW4 to view the contents of the log in2.
flash, which should be initialized to 00-00-00 on reset.
Press and hold the Tamper button (near Reset below the3.
LCD) for a few seconds before releasing it. You should see
new events recorded in the tamper log: one timestamp
with code “P” to indicate a tamper event due to a change
in state of the MCU Tamper pin, and another with
timestamp code “A” to indicate when the pin tamper
event was cleared. The recorded time of each tamper event
is displayed as HH-MM-SSC where HH=hours,
MM=minutes, SS=seconds, and C=tamper code.
Now remove the CR20324. battery and wait a few seconds
before you reinstall it. Again, you should notice two new
entries in the tamper log. One with a timestamp code “b”
to indicate a VBAT supply interruption during normal MCU
operation, and another with the “A” timestamp code to
again note when the battery tamper event cleared.
DEMOEM Lab Tutorial: V1 ColdFire MCU for smart metering

DEMOEM Lab Tutorial: V1 ColdFire MCU for smart metering
Clear the log of all entries by tapping either (SW2 + SW3) 5.
or (SW2 + SW4) simultaneously. When the log is cleared,
a message will be displayed on the LCD as follows:
State
3
Configure the IRTC Time of Day
During this lab, you will use the simple user interface
to configure the IRTC for the desired time of day. If
you have a CR2032 battery installed on the DEMOEM
board, and jumper J37 in place per the IRTC Tamper
Log exercise above, you will also be able to observe the
correct time displayed by the demo even after extended
periods with the board power disconnected.
User Interface
• SW1 advances to the next state/demo.
• SW2 increments the hours setting by one.
• SW3 increments the minutes setting by one.
• SW4 resets the seconds counter to zero.
Step by Step Instructions
Press SW1 until you see the IRTC Time1. of Day state
on the display, with the following syntax: HHH-MM-
SS, where H marks the hours field, HH=hours,
MM=minutes, and SS=seconds.
Press SW2, SW3, and SW4 to set the time as desired.2.
Now, if you have a CR2032 battery installed on your3.
DEMOEM board, either disconnect the USB cable from the
board, or use power switch K6 to disable power to the
MCU. Wait a while and then restore power to the board. On
power-up, the demo code will display the State 0 welcome
message again. However, when you use SW1 to advance
back to the IRTC TOD state, you will notice the clock
has continued from the setting you programmed prior to
powering down the board.
In order to reset the IRTC settings back to default, remove4.
the CR2032 battery, then disable power to the MCU using
switch K6 or by disconnecting the USB cable.
State
4
Configure the IRTC Calendar
(Date) Settings
As for the previous lab, you will use the simple user
interface to configure the IRTC for the desired day,
month, and year. If you have a CR2032 battery installed
on the DEMOEM board, and jumper J37 in place per the
IRTC Tamper Log exercise above, you will also be able
to observe the correct time and date displayed by the
demo even after extended periods with the board
power disconnected.
User Interface
• SW1 advances to the next state/demo.
• SW2 increments the year setting by one.
• SW3 increments the month setting by one.
• SW4 increments the day setting by one.
Step by Step Instructions
Press SW1 until you see the IRTC Calendar1. state on the
display, with the following syntax: dDD-MM-YY, where d
marks the days field, DD=day, MM=month, and YY=year.
Press SW2, SW3, and SW4 to set the year, month, and day2.
settings, respectively.
You can repeat the power-down test from the IRTC TOD3.
exercise above, and again will see that time and date
settings are retained over extended periods of MCU power-
down as long as the VBAT battery source is maintained.
Use SW1 to return to the IRTC TOD state and set the time to4.
23:59:00, for instance. Wait one minute and verify that the
date incremented as expected. Note that the IRTC cannot
safeguard against invalid date settings (for instance, you
may initialize the date to February 30), but will adjust the
date appropriately given a valid initial setting.
State
5
Use a Pair of DEMOEM
Boards to Demonstrate Serial
Communications via Infrared
Transmission and Reception
The lab requires two DEMOEM boards positioned
with their infrared communications ports aligned.
The MCU’s SCI1 asynchronous serial communications
port is connected to an infrared transmitter and
receiver positioned near the board edge. The infrared
demonstration will allow you to select the data to be
transmitted from each DEMOEM board, and likewise
monitor the data received from the other board. In
addition, the serial port’s drive strength setting will allow
you to adjust the range of infrared communications for
close or farther-reaching communications.
User Interface
• SW1 advances to the next state/demo.
• SW2 increments the data to be transmitted by one.
• SW3 decrements the data to be transmitted by one.
• SW4 toggles the Tx port between low and high drive
strength.
Step by Step Instructions
Use SW1 to select the infrared demo state, as shown below:1.
The display indicates the data to transmit (“T”), the data last2.
received (“R”), and the port drive strength setting (“S”). The
default setting is to transmit data value 0x35 with normal
port drive strength.
Use SW2 or SW3 to set the transmit data to different values3.
for each DEMOEM board. Verify the data setting transmitted
by one board is the same value received by the other board
(Note that data is transmitted once per button press, not
continuously).
Adjust the distance between the two boards until4.
communication is just lost, then move them slightly together
again until communication is restored.
Now use SW4 to change the port drive strength setting5.
for each board and repeat step four to note the change in
effective communications distance for each drive strength
setting.
State
6
Use the MCF51EM LCD Driver
Programmable Blink Feature to
Control Duration of Active/Blank
Display
The MCF51EM LCD driver has a feature that allows
the user to disable all segments at once, resulting in
a blank display. This feature is enhanced to further
allow the user to automatically alternate between
active and blank display to create a blink effect with
programmable duration (50% duty cycle between
blank and active display).
User Interface
• SW1 advances to the next state/demo.
• SW2 increments blink period (longer duration).
• SW3 decrements the blink period (shorter duration).
• SW4 has no functionality for this demo.
Step by Step Instructions
Press SW1 until you see the LCD Blinker state on1.
the display.
Press SW2 or SW3 to change the rate of the blinking2.
display. SW2 slows the rate of blinking, while SW3 speeds
the rate of blinking.
State
7
Use the MCF51EM LCD Driver’s
Internal Voltage Regulator Trim
Capability as Software Contrast
Control
The MCF51EM LCD driver has a selectable internal
voltage regulator with four-bit trim that serves as a
software contrast control for the display, eliminating
the need for contrast control circuitry external to the
MCU. During this final lab exercise, you will use the
simple DEMOEM user interface to change the contrast
of the LCD by adjusting the internal voltage regulator’s
trim setting.
User Interface
• SW1 advances to the next state/demo.
• SW2 increments voltage regulator output by 1.5%.
• SW3 decrements voltage regulator output by 1.5%.
• SW4 has no functionality for this demo.
Step by Step Instructions
Press SW1 until you see the LCD Contrast state on1.
the display.
Press SW2 or SW3 to change the output of the internal2.
voltage regulator. SW2 increases the regulator output,
increasing the LCD contrast. SW3 decreases the regulator
output, decreasing the LCD.

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and other countries. All other product or service names are the property of their respective owners. © 2010 Freescale Semiconductor, Inc.
Doc Number: MCF51EM246LB REV 0
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Get to know the DEMOEM
Program Flow Diagram
0
Welcome
1
Metering
Demo
2
Tamper
Log
3
IRTC
TOD
4
IRTC
Calendar
5
Infrared
Demo
6
LCD
Blink
7
LCD
Contrast
Barrel
connector
for external
power
LEDs
USB for
embedded
BDM
Optional
RS232 serial
interface
Custom
LCD glass
Push
buttons for
demo menu
navigation
9S08QE8
signal
generator
circuit for
three-phase
emulation
Daughter card
adapter for 80-
or 100-pin MCU
package options
Power
switch
IR Comm
port