UM232R 查看數據表（PDF） - Future Technology

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UM232R

USB-Serial UART Development Module

Future Technology 

Page 18

8. Internal EEPROM Configuration

Following a power-on reset or a USB reset the FT232R will scan its internal EEPROM and read the USB configuration

descriptors stored there. The default values programmed into the internal EEPROM in the FT232RL used on the

UM232R are shown in Table 17.

Table 17 - Default Internal EEPROM Configuration

Parameter

USB Vendor ID (VID)

Value

0403h

USB Product ID (PID)

6001h

Serial Number Enabled?

Yes

Serial Number

See Note

Pull Down I/O Pins in USB Suspend

Disabled

Manufacturer Name

Manufacturer ID

Product Description

Max Bus Power Current

Power Source

Device Type

USB Version

FTDI

FT

UM232R USB <->

Serial

100mA

Bus Powered

FT232R

0200

Remote Wake up

High Current I/Os

Load VCP Driver

CBUS0

CBUS1

CBUS2

CBUS3

CBUS4

Invert TXD

Invert RXD

Invert RTS#

Invert CTS#

Invert DTR#

Invert DSR#

Invert DCD#

Invert RI#

Enabled

Disabled

Enabled

TXLED#

RXLED#

PWREN#

PWREN#

SLEEP#

Disabled

Disabled

Disabled

Disabled

Disabled

Disabled

Disabled

Disabled

Notes

FTDI default VID (hex)

FTDI default PID (hex)

A unique serial number is generated and programmed into the EEPROM

during final test of the UM232R module.

Enabling this option will make the device pull down on the UART interface

lines when the power is shut off (PWREN# is high)

Serial Number prefix.

Returns USB 2.0 device descriptor to the host. Note: The device is be

a USB 2.0 Full Speed device (12Mb/s) as opposed to a USB 2.0 High

Speed device (480Mb/s).

Taking RI# low will wake up the USB host controller from suspend.

Enables the high drive level on the UART and CBUS I/O pins

Makes the device load the VCP driver interface for the device.

Default configuration of CBUS0 - Transmit LED drive

Default configuration of CBUS1 - Receive LED drive

Default configuration of CBUS2 - Power enable. Low after USB

enumeration, high during USB suspend.

Default configuration of CBUS3 - Power enable. Low after USB

enumeration, high during USB suspend.

Default configuration of CBUS4 - Low during USB suspend.

Signal on this pin becomes TXD# if enabled.

Signal on this pin becomes RXD# if enabled.

Signal on this pin becomes RTS if enabled.

Signal on this pin becomes CTS if enabled.

Signal on this pin becomes DTR if enabled.

Signal on this pin becomes DSR if enabled.

Signal on this pin becomes DCD if enabled.

Signal on this pin becomes RI if enabled.

The internal EEPROM in the FT232R can be programmed over USB using the utility program MPROG. MPROG can

be downloaded from the FTDI website. Version 2.8a or later is required for the FT232R chip. Users who do not have

their own USB Vendor ID but who would like to use a unique Product ID in their design can apply to FTDI for a free

block of unique PIDs. Contact FTDI support for this service.

UM232R USB-Serial UART Development Module Datasheet Version 1.02

© Future Technology Devices International Ltd. 2005

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