ST UM0250 Manuale utente

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

UM0250 Getting started

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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.

Getting started UM0250

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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)

UM0250 Getting started

5/12

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.

DB9 female

Running the Low-speed USB/RS232 Evaluation Kit UM0250

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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.

UM0250 Running the Low-speed USB/RS232 Evaluation Kit

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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

Running the Low-speed USB/RS232 Evaluation Kit UM0250

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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

UM0250 Running the Low-speed USB/RS232 Evaluation Kit

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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.

Low-speed USB/RS232 Evaluation Board diagram UM0250

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3 Low-speed USB/RS232 Evaluation Board diagram

Figure 6. Low-speed USB/RS232 Evaluation Board schematics

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

USB CON

100nF

C11

100nF

+C2

10uF/6.3V

10nF

LED1

YELLOW LED

220

1k5

10K

C10

100nF

VDD

18pF

RESET

OSCOUT

PB7 (10mA)/IT8/AIN7 17

PB6 (10mA)/IT7/AIN6 18

PB4 (10mA)/IT5/AIN4 21

PB5 (10mA)/IT6/AIN5 20

VDD

PA0/MCO 1

PA1 (25mA)/SDA/ICCDATA 40

PA2 (25mA)/SCL/ICCCLK 31

PA3/EXTCLK 30

PA4/ICAP1/IT1 29

PA5/ICAP2/IT2 28

Vpp/TEST

VSSA

VDDA

PB3 (10mA)/AIN3 22

PB2 (10mA)/AIN2 23

PB1 (10mA)/AIN1 24

PB0 (10mA)/AIN0 25

USBVCC

USBDM

PC1/TDO 12

PC0/RDI 13

PA7/COMP2/IT4 26

PA6/COMP1/IT3 27

USBDP

PC2/USBOE 11

OSCIN

VSS

PD7 39

PD6 38

PD4 36

PD5 37

PD3/AIN11 35

PD2/AIN10 34

PD1/AIN9 33

PD0/AIN8 32

ST72F63B_QFN40

1 2

3 4

5 6

7 8

9 10

ICC FEATURE

VDD

PA1/ICCDATA

PA2/ICCCLK

RESET

VPP

OSCIN

RESET

VPP

D Connector 9

VDD

PA0

TxD

RTS

RxD

CTS

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

Header 8X2

1 2

3 4

5 6

7 8

9 10

11 12

13 14

15 16

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

220

PC2

PC1

PC0

PB1

PB4

TxD

RTS

RxD

CTS

PB0

3 1

XT1

24MHz_NX2520SA

470

C1+ 2

C2+ 5

GND 18

C1- 4

VCC

C2- 6

V-

V+

SHDN

NC 11

ST3222E

SHDN

SH1

SH2

SH3

SH4

SH5

SH6

ST72F60_QFN40 (Port D not available)

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