Philips Computer Hardware LPC2138 User Manual

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V1.4  
User’s Guide  
Philips LPC2138 Target Board  
Ordering code  
Dimensions  
ITLPC2138  
100 x 96 mm  
Figure 1: ITLPC2138 Target Board  
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Introduction  
Philips LPC2138 Target Board is an evaluation and a development system for Philips ARM7TDMI-S based  
LPC2138 microcontroller. The ITLPC2138 package consists of a USB cable and a target board populated with  
Philips LPC2138 CPU, minimum peripherals, JTAG debug connector, ETM trace connector and an on-board  
integrated iSYSTEM debugger.  
The user can write and debug the application using the on-board integrated iSYSTEM debugger, which connects  
to the PC through the USB connection. The board requires no external power supply since it’s powered from the  
PC USB port.  
An external ARM7TDMI-S debugger (including e.g. ETM support) can be used for debugging as an alternative  
to the on-board integrated debugger.  
Description  
View of the ITLPC2138  
Figure 2: Top View of the ITLPC2138  
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Block Diagram  
Figure 3: ITLPC2138 Block diagram  
Notes  
1. The board provides 16-pin connector for the optional LCD display (type CMC216x04), which is not  
included in the package.  
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Components List  
Name  
P1  
P2  
P3  
P4  
P5  
J1  
Description  
Connector for manufacturing purpose  
ETM Trace connector  
JTAG debug connector  
USB connector (integrated debugger)  
DB9 connector, serial port (UART1)  
Expansion connector GPIO pins P0.0 – P0.7  
Expansion connector GPIO pins P0.8 – P0.15  
Expansion connector GPIO pins P0.16 – P0.23  
Expansion connector GPIO pins P0.25 – P0.31  
Expansion connector GPIO pins P1.16 – P1.23  
Expansion connector GPIO pins P1.24 and P1.25  
J2  
J3  
J4  
J5  
J6  
J7 - J10, J15 –  
J20, J22,J25  
Jumpers  
J11  
RTC power supply input (3.3V)  
Connector for manufacturing purpose  
DA converter output  
Serial port (UART0)  
16-pin LCD connector  
User LEDs  
J12  
J13  
J14  
J21  
LD0 – LD3  
LD11  
Power LED 5V  
LD12  
Power LED 3,3V  
T0 – T3  
Reset  
TRIM-PT  
Push buttons  
Reset button  
Trimmer potentiometer  
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Power Supply  
The target board is powered from the PC USB port, through which winIDEA (IDE) running on a PC, connects to  
the on-board integrated debugger. Connection is made using a standard USB cable. Battery power supply for  
RTC can be optionally connected to J11 (see J11 description for more details).  
Jumper & Connector Descriptions  
J7: Trace Port Enable: J7 is set to enable pins P1.25:16 to operate as ETM Trace port after reset.  
Default not set.  
J8: Debug Port Enable: J8 is set to enable pins P1.31:26 to operate as a JTAG Debug port after reset.  
Default is set.  
J9: Debug Mode: J9 selects whether iSYSTEM on-board integrated USB-JTAG debugger is used or an  
external debug tool. Default set in position 1-2.*  
J10: RTC Power Supply Selector: J10 connects Vbat pin of LPC2138 to the main 3.3V.  
J11: RTC Power supply: PCB terminal providing connection for battery. When battery power supply  
applied to J11 is used, J10 must be open.  
J12: Manufacturing purpose connections  
J13: Analog Output: J13 is analog output from OP amplifier, which connects to output of the DA  
converter.  
J14: Serial Port (UART 0): three pins connected to UART0. See connectors for more details.  
J15: User LEDs Enable: enables the LED driver connecting the on-board LEDs to GPIO P0.8 – P0.11.  
J16: User Buttons Enable: enables buttons driver connecting the on-board buttons to GPIO P0.12 –  
P0.15. Pushing the button generates a low signal. If J16 is set, the CPU will not start in Boot-loader  
mode (see J25 description).  
J17: LCD Enable Signal: connects GPIO P0.21 to the LCD enable pin.  
J18: LCD R/W Signal: connects GPIO P0.22 to the LCD R/W pin.  
J19: Analog Output Enable: connects DA converter output (GPIO P0.25) to the OP amplifier.  
J20: Analog Input Enable: connects the TRIM potentiometer to the analog input AD0.0 (GPIO  
P0.27).  
J21: 16 Pin LCD Connector: see connectors  
J22: LCD LED Backlight Enable: J22 is set to turn on LCD backlight.  
J25: Startup mode (populated on the bottom side of the target board): J25 connects either a pull-up  
(USER mode) or a pull-down (BOOT-loader mode) to P0.14. Default set in position USER (User  
mode). J16 must be removed when setting J25 in position BOOT, otherwise J25 setting is not effective.  
*Jumper pin 1 is marked with a white square on the ITLPC2138 PCB. If pin 1 cannot be located directly from  
the ITLPC2138, please use Figure 2 for assistance.  
Note: Don’t change jumper settings while the target board is supplied with power!  
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Connectors  
DB9 male connector UART1 (P5)  
Pin No.  
Symbol  
RxD  
2
3
5
TxD  
GND  
The serial port is configured as a standard 3-wire interface. Cross female to female cable is needed for  
connection with PC computer COM port.  
3-pin serial connector UART0 (J14)  
Pin No.  
Symbol  
RxD  
1
2
3
TxD  
GND  
The serial port is configured as a standard 3-wire interface.  
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16-pin LCD connector (J21)  
Top View  
Pin Assignment for Crystal Clear technology CMC216x04 LCD  
Pin No.  
Symbol  
GND  
Vdd  
Vo  
Function  
1
2
Ground Terminal  
Supply Terminal  
3
Power Supply for LCD Driver  
Register Select Signal  
Read/Write Selection  
Enable Signal  
4
RS  
5
R/W  
E
6
7
DB0  
DB1  
DB2  
DB3  
DB4  
DB5  
DB6  
DB7  
BL+  
BL-  
Data Bus Line (Not used)  
Data Bus Line (Not used)  
Data Bus Line (Not used)  
Data Bus Line (Not used)  
Data Bus Line  
8
9
10  
11  
12  
13  
14  
15  
16  
Data Bus Line  
Data Bus Line  
Data Bus Line  
LED Backlight Power Supply  
LED Backlight Ground  
20-pin JTAG Debug Connector (P3)  
Not used  
CPU_TRST  
CPU_TDI  
CPU_TMS  
CTCK  
1
3
5
7
9
2
4
6
8
T3V3  
GND  
GND  
GND  
10 GND  
Not used  
CPU_TDO  
11 12 GND  
13 14 GND  
CPU_RESET 15 16 GND  
Not used  
Not used  
17 18 GND  
19 20 GND  
An external JTAG debug tool can be connected to a 20-pin P3 debug connector. Jumper J9 must be set to 2-3  
position when using an external debugger.  
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38-pin Mictor JTAG Debug & ETM Trace Connector (P2)  
Signal  
Not used  
Not used  
GND  
Not used  
CPU_RESET  
CPU_TDO  
GND  
Pin  
1
3
5
7
Pin  
2
4
6
8
Signal  
Not used  
Not used  
TRACECLK  
Not used  
Not used  
T3V3  
Not used  
GND  
GND  
9
10  
12  
14  
16  
18  
20  
22  
24  
26  
28  
30  
32  
34  
36  
38  
11  
13  
15  
17  
19  
21  
23  
25  
27  
29  
31  
33  
35  
37  
CTCK  
CPU_TMS  
CPU_TDI  
CPU_TRST  
GND  
GND  
GND  
P1.19  
P1.18  
P1.17  
P1.16  
P1.20  
P1.23  
GND  
GND  
GND  
GND  
GND  
GND  
GND  
P1.22  
P1.21  
An external JTAG & ETM debug tool can be connected to a 38-pin Mictor P2 debug connector. Jumper J9 must  
be set to 2-3 position when using an external debugger.  
CPU expansion connectors  
Figure 4: Expansion connectors  
All CPU signals are available on the expansion connectors, which are standard connectors with a 2.54 mm raster.  
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Schematic  
Note: On-board integrated debugger is not part of the schematic.  
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Licensing the on-board integrated debugger  
A 30-days evaluation period starts after the debugger (winIDEA) connects to the ITLPC2138 for the first time.  
Within the evaluation period, the user should request a regular license from iSYSTEM. Run the request wizard  
to obtain the license INIT string by pressing the ‘Request INIT…’ button in the ‘Hardware/Hardware/License’  
tab.  
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Use of the on-board integrated debugger  
Follow below instructions, in order to get a sample application running with “out of the box” experience. All  
jumpers are set in the default position during the final tests in the manufacturing.  
If winIDEA 2006 CD is not part of the package, please obtain winIDEA 2006 setup from your local iSYSTEM  
office or from www.isystem.com.  
Install winIDEA 2006 (IDE) full setup on a PC  
Verify jumpers J15-J20 (see Jumpers description for their default position)  
Verify that jumper J8 is set  
Verify that jumper J7 is not set.  
Verify that jumper J9 is set in position 1-2 (on-board integrated debugger enabled).  
Open winIDEA 2006 application and open a sample workspace for the ITLPC2138 running from the  
internal flash.  
Connect the USB cable to the PC and to the ITLPC2138.  
Windows should auto-detect a new USB device and install belonging USB driver. In case of any  
problems, the driver is located under winIDEA install directory (e.g. c:\winIDEA\2006\USBDrv).  
Disconnect the USB cable from the ITLPC2138 and then connect it again. The two power LEDs  
should turn on. The target board is not powered if the LEDs don’t lit and the problem needs to be  
resolved before proceeding to the next step!  
Finally, execute Debug/Debug Reset. This should initialize the development system and the user  
should be able to write to the internal CPU RAM through the memory window.  
Next, execute Debug/Download. This should program and run the application until main function. The  
development system is now ready for the debugging.  
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Use of an external debugger  
An external debugger can be:  
a JTAG debugger, which connects to a 20-pin P3 connector  
a development tool supporting JTAG debugging and ETM (on-chip trace), which connects to a 38-pin  
Mictor P2 connector  
Setting up a debug environment for the first time  
Verify jumpers J15-J20 (see Jumpers description for their default position)  
Verify that jumper J8 is set  
Verify that jumper J7 is set if your development tool connects to P2  
Verify that jumper J9 is set in position 2-3 (on-board integrated debugger disabled)  
winIDEA 2006 application must to be installed and run once in order to power the ITLPC2138 board  
through the USB connection.  
Connect the USB cable to the PC and to the ITLPC2138.  
Windows should auto-detect a new USB device and install belonging USB driver. In case of any  
problems, the driver is located under winIDEA install directory (e.g. c:\winIDEA\2006\USBDrv).  
Disconnect the USB cable from the ITLPC2138 and then connect it again. The two power LEDs  
should turn on. The target board is not powered if the LEDs don’t lit and the problem needs to be  
resolved before proceeding to the next step!  
Disconnect the USB cable from the ITLPC2138 once again, connect the external development system  
to P2 or P3 (depending on the development system), turn it on and then connect back the USB cable.  
Execute a debug command equivalent to the CPU reset debug command. This should initialize the  
development system and the user should be able to write to the internal CPU RAM through the  
memory window. The development system should be now ready for use.  
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Troubleshooting  
The flash boot loader code is executed every time the CPU is powered or reset. The loader can execute the ISP  
command handler or the user application code. P0.14 is sensed on a rising edge on the RST (CPU reset) pin. If a  
low level is detected, ISP command handler starts and takes over control of the CPU after reset. If there is no  
request for the ISP command handler execution (a high-level detected), a search is made for a valid user  
program. If a valid user program is found then the execution control is transferred to it. Refer to CPU User  
Manual for more details on CPU startup mode.  
Normally, jumper J25 is set for ‘User mode’ by default. Boot-loader mode should be normally selected only for  
troubleshooting or when the user explicitly wants to use Boot-loader mode. J16 must be removed when Boot-  
loader mode is selected (see J16 description for more details).  
There was a case, where the code was programmed in the flash, which disabled the JTAG debug port shortly  
after reset. Due to the Philips implementation, the debugger cannot take over control over the CPU immediately  
after reset, but a part of code is executed before the CPU can be stopped by the debugger. In this particular case,  
the application disabled JTAG port before the debugger took control over the CPU and the debugger could not  
connect to the CPU at all. Thereby, note that if the debugger cannot connect to the CPU (winIDEA reports  
“Cannot stop CPU”), it may be due to bad program in the flash. In this case, Boot-loader mode has to be selected  
(in order for the CPU to start executing ISP command handler), in which the debugger can always stop the  
program and take over control over the CPU. Then a new valid program can be programmed in the flash or flash  
erased. Then the User mode can be used again.  
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Notes:  
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Disclaimer: iSYSTEM assumes no responsibility for any errors which may appear in this document, reserves the  
right to change devices or specifications detailed herein at any time without notice, and does not make any  
commitment to update the information herein.  
© iSYSTEM. All rights reserved.  
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