ST UM0250 User manual

July 2006 Rev 1 1/12
UM0250
User manual
Getting started with the ST7
Low-speed USB/RS232 Evaluation Kit
Introduction
The Low-speed USB/RS232 Evaluation Kit (STEVAL-PCC02V1) has been created to
provide a complete reference design for a serial port bridge as well as an evaluation board
for ST72F63B/60 devices in QFN40 package. This application is used to interface between
devices with a serial port (RS-232 type) and a host computer USB port. USB data transfers
comply with HID-class protocols.
The bridge is based on a USB low-speed microcontroller manufactured by
STMicroelectronics which provides a maximum guaranteed USB transfer rate of 800 bytes
per second. Flow control has therefore been implemented to ensure data transfer integrity
when interfacing with the serial port at rates up to 38400 bits per second (bps).
The bridge application is evaluated on a PC by running a dedicated applet that controls and
monitors data transfers on both the USB and serial COM ports.
The included hardware provides In-Circuit Programming (ICP) capabilities for the
microcontroller and almost all the MCU's I/Os are available on expansion connectors to
evaluate different applications.
The RS-232 part can be separated by removing the appropriate soldering joints (shunts).
This can be used to modify certain firmware or hardware parameters for evaluation or
customization purposes.
The following development tools can be ordered separately: assembler, linker, C compiler,
source level debugger, hardware emulator, programming boards and gang programmer. For
ordering information, see our website at http://www.st.com/mcu or contact your local sales
office.
www.st.com

Contents UM0250
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Contents
1 Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 System requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Package contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.3 Software installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.4 Hardware installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4.1 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4.2 Data transfer via PC serial port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4.3 In-Circuit Communication (ICC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Running the Low-speed USB/RS232 Evaluation Kit . . . . . . . . . . . . . . . 6
2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Low-speed USB/RS232 evaluation program . . . . . . . . . . . . . . . . . . . . . . . 7
2.2.1 Device Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2.2 Data Transfers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3 Adding extra circuitry on expansion connectors . . . . . . . . . . . . . . . . . . . . . 9
3 Low-speed USB/RS232 Evaluation Board diagram . . . . . . . . . . . . . . . 10
4 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

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1 Getting started
1.1 System requirements
In order to use the Low-speed USB/RS232 Evaluation Kit with the Windows operating
system, a recent version of Windows, such as Windows 98, Windows Millennium or
Windows 2000 must be installed on the PC.
The version of the Windows OS installed on your PC may be determined by clicking on the
“System” icon in the Control Panel.
Important: When running the HID evaluation board applet provided in the package, verify
that the correct version of the HID.dll file is installed:
●Windows 98: HID.dll - Version 4.10.1998
●Windows 98 SE: HID.dll - Version 4.10.2222
●Windows Millennium: HID.dll - Version 4.90.300.1
●Windows 2000: HID.dll - Version 5.00.2134.1
●Windows XP: HID.dll - Version 5.1.2600.0
1.2 Package contents
The Low-speed USB/RS232 Evaluation Kit includes the following items:
Hardware content
●One evaluation board with ICC, USB and Serial connectors.
●One soldered ST72F60K2U1 low-speed USB microcontroller device (QFN40 package).
This is a FLASH device allowing up to 100 reprogramming cycles. The ST72F60K2U1
is delivered already programmed with the evaluation firmware.
Software contents (Contact the Sales Office or www.st.com for the most recent version)
●PC executable software for evaluating the USB/Serial Port Bridge. The source file,
written in Delphi, is provided as an application example using the HID driver.
●ST7 firmware (C source code) for the ST72F60/63B
Documentation (Contact the Sales Office or www.st.com for the most recent version)
●ST7260 and ST7263B datasheets
●PCB production data
●ST7263B/ST7260 flyer
●This Getting Started Manual
1.3 Software installation
Install the Bridgels.exe file on your computer.

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1.4 Hardware installation
Figure 1 shows the location of the main components of the evaluation board. The schematic
drawing is given in Figure 6: Low-speed USB/RS232 Evaluation Board schematics on
page 10.
Figure 1. Evaluation Board Layout
1.4.1 Power supply
The Low-speed USB/RS232 Evaluation Board is directly supplied by the USB Connector
(bus-powered) and therefore does not require an external voltage supply.
1.4.2 Data transfer via PC serial port
When connected to a PC serial port for data transfer purposes, a DTE (Data Terminal
Equipment) to DTE configuration is required. As a result, a cross-wired RS-232 cable must
be used as shown in Figure 2.
The Low-speed USB/RS232 Evaluation Board is equipped with two LEDs that display the
data transfer status:
●Yellow/Orange LED: USB to Serial Bus transfer is active,
●Green LED: Serial Bus to USB transfer is active.
ST3222E (on reverse side)
USB Connector & Supply
ST72F60Kx or ST72F63BDx
ICC Connector
RS-232 Connector
USB to Serial Port Transfer
Serial Port to USB Transfer
Active LED (Green)
Active LED (Yellow)

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Figure 2. Cross-wired serial cable connection diagram
1.4.3 In-Circuit Communication (ICC)
The 10-pin connector must be connected to a programming tool in order to program or
erase the microcontroller Flash memory.
For further information, please refer to both the ICC Protocol Reference Manual and the ST7
Flash Programming Reference Manual, available online from http://www.st.com/mcu
Note: The USB cable must be plugged in to supply the board with voltage.
1
2
3
4
5
9
8
7
6
1
2
3
4
5
6
7
8
9
DB9 female
DB9 female

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2 Running the Low-speed USB/RS232 Evaluation Kit
2.1 Introduction
The Low-speed USB/RS232 Evaluation Kit consists of two main parts:
●the physical board,
●the Low-speed USB/RS232 Evaluation software running on your PC.
First, connect the evaluation board to the PC via the USB cable. As a result, the evaluation
board is enumerated as a USB HID device as shown Figure 3, and is ready to use. You may
be required to insert your Windows CD-ROM.
Figure 3. Enumeration Result
When you start the Low-speed USB/RS232 Evaluation program on the PC, a graphical
interface is displayed for controlling and monitoring the data transfers on the USB and serial
ports of the PC. This PC software is also used to evaluate the enumeration process and to
set the communication parameters.

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2.2 Low-speed USB/RS232 evaluation program
2.2.1 Device Selection
USB Enumeration
The Device Selection window, shown in Figure 4, displays the following information:
●Available USB HID devices
All applicable devices connected to the PC are displayed in this window. The ST7
RS232 USB Bridge is displayed if the enumeration has been successfully completed.
●Device information
This information, obtained during the enumeration phase, refers to the highlighted
device in the “Available Devices” window: Vendor ID, Product ID and Version numbers.
(Refer to the USB Specification version 1.1 or higher). Additionally, as string information is
supported, the Manufacturer name, Product and Serial Number are displayed.
COM port settings
This function selects the COM port used by the Low-speed USB/RS232 Evaluation program
to emulate a serial port communication. The selection None is not fully implemented in
version 1.0.0 of the evaluation software.
Common settings
This function is used to select the baudrate of the bridge in the bridge firmware. If the applet
is used to emulate the serial port, it also configures the COM port of the PC. Otherwise, the
serial port baudrate must be defined as the same value in the other applet or device. The
maximum applicable baudrate for this board is 38400 bit/s.
Figure 4. Device Selection Window
38400

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2.2.2 Data Transfers
Serial Port
The two following items do not apply if None has been selected in the “COM Port Setting”
box of the Device Selection window.
●PC Flow Control defines the flow control method used by the COM port when the
applet controls the COM port of the PC.
●Automatic received (USB) to sent (Serial) comparison verifies that the data received by
the USB port is equal to the data sent by the COM port of the PC.
●Loop: Send Serial, Receive USB is used to perform serial to USB transfers in Loop
mode. Unchecking this box during the data transfer aborts the transfer.
If the serial port is handled by another applet or PC, the Automatic received... box must not
be checked and the Loop box must be checked, depending on the required configuration.
USB Port
These items are validated only if the bridge is connected to the USB port.
●Hardware Flow Control done by bridge is used to enable/disable the RTS/CTS flow
control performed by the bridge on the serial port.
●Automatic received (Serial) to sent (USB) comparison verifies that the data received by
the serial port is equal to the data sent by the USB port.
●Loop: Send USB, Receive Serial is used to is used to perform USB to serial transfers in
Loop mode. Unchecking this box during the data transfer aborts the transfer.
Figure 5. Data Transfer Window

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2.3 Adding extra circuitry on expansion connectors
The evaluation board features two 16-hole connectors (P1 & P2) with all the microcontroller
I/O pins and which together with ICC connector (P3) are giving access to almost all MCU
pins.
These connection points can be used for signal probing or adding extra circuitry needed to
evaluate different applications. The figures in the next section give the definition of these
points for each connector.

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3 Low-speed USB/RS232 Evaluation Board diagram
Figure 6. Low-speed USB/RS232 Evaluation Board schematics
1 1
2 2
3 3
4 4
D D
C C B B
A A
Title
Size Document Number Rev Date: Sheet of
1.0
1115.05.2006
USB-UART Bridge Eval Board
VBUS 1
D- 2
D+ 3
GND 4
J1 USB CON
C3 100nF
C11 100nF
+C2
10uF/6.3V
C8 10nF
LED1 YELLOW LED
R4 220
R2 1k5
R6 10K
C10 100nF
VDD
C1 18pF C4 18pF
RESET
14
OSCOUT
8
PB7 (10mA)/IT8/AIN7 17 PB6 (10mA)/IT7/AIN6 18 PB4 (10mA)/IT5/AIN4 21 PB5 (10mA)/IT6/AIN5 20
VDD
7
PA0/MCO 1
PA1 (25mA)/SDA/ICCDATA 40
PA2 (25mA)/SCL/ICCCLK 31
PA3/EXTCLK 30
NC
15
PA4/ICAP1/IT1 29 PA5/ICAP2/IT2 28
Vpp/TEST
19
VSSA
2
VDDA
6
PB3 (10mA)/AIN3 22 PB2 (10mA)/AIN2 23 PB1 (10mA)/AIN1 24 PB0 (10mA)/AIN0 25
USBVCC
5
USBDM
4
PC1/TDO 12
PC0/RDI 13
PA7/COMP2/IT4 26 PA6/COMP1/IT3 27
USBDP
3
PC2/USBOE 11
OSCIN
9
VSS
10
NC
16
PD7 39 PD6 38 PD4 36 PD5 37
PD3/AIN11 35 PD2/AIN10 34
PD1/AIN9 33 PD0/AIN8 32
U1 ST72F63B_QFN40
1 2 3 4 5 6 7 8 9 10
P3 ICC FEATURE
VDD
PA1/ICCDATA PA2/ICCCLK RESET VPP
OSCIN
OSCIN RESET VPP
1 2 3 4 5 6 7 8 9
11 10
J2 D Connector 9
VDD
VDD
PA0
TxD RTS RxD CTS
C7 100nF C5 100nF
C6 100nF C9 100nF
VDD
USBDM USBDP
USBVCC
PA0 PA1/ICCDATA PA2/ICCCLK PA3 PA4 PA5 PA6 PA7 PB0 PB1 PB2 PB3 PB4 PB5 PB6 PB7 PC0 PC1 PC2 PD0 PD1 PD2 PD3 PD4 PD5 PD6 PD7
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
P1 Header 8X2
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
P2 Header 8X2
PA0PA1/ICCDATA PA2/ICCCLKPA3 PA4PA5 PA6PA7
PB0 PB1 PB2 PB3 PB4 PB5 PB6 PB7 PC0 PC1 PC2 PD0 PD1
PD2PD3 PD4PD5 PD6PD7
VDD
USBVCC
VDD
LED2
GREEN LED
R5 220
PC2
PC1 PC0 PB1 PB4
TxD RTS RxD CTS
PB0
2
3 1
4
XT1 24MHz_NX2520SA
R3 470
16
12 13
9
15 10
17
8
C1+ 2 C2+ 5
GND 18
C1- 4
VCC
19
C2- 6
V-
7
V+
3
1
SHDN
20
NC 11
NC
14
U3 ST3222E
SHDN
SHDN
SH1 SH2 SH3 SH4 SH5 SH6
ST72F60_QFN40 (Port D not available)