FT232R datasheet(13/43 Pages) FTDI

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Document No.: FT_000053

FT232R USB UART IC Datasheet Version 2.07

Clearance No.: FTDI# 38

3.5 CBUS Signal Options

The following options can be configured on the CBUS I/O pins. CBUS signal options are common to both

package versions of the FT232R. These options can be configured in the internal EEPROM using the

software utility FT_PPROG or MPROG, which can be downloaded from the FTDI Utilities

(www.ftdichip.com). The default configuration is described in Section 8.

CBUS

Signal

Option

Available On CBUS Pin

Description

TXDEN

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4

Enable transmit data for RS485

PWREN#

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4

Output is low after the device has been configured by

USB, then high during USB suspend mode. This output can

be used to control power to external logic P-Channel logic

level MOSFET switch. Enable the interface pull-down

option when using the PWREN# in this way.*

TXLED#

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4

Transmit data LED drive – pulses low when transmitting

data via USB. See Section 7.5 for more details.

RXLED#

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4

Receive data LED drive – pulses low when receiving data

via USB. See Section 7.5 for more details.

TX&RXLED#

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4

LED drive – pulses low when transmitting or receiving data

via USB. See Section 7.5 for more details.

SLEEP#

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4

Goes low during USB suspend mode. Typically used to

power down an external TTL to RS232 level converter IC

in USB to RS232 converter designs.

CLK48

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4

48MHz Clock output.**

CLK24

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4

24 MHz Clock output.**

CLK12

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4

12 MHz Clock output.**

CLK6

CBUS0, CBUS1, CBUS2, CBUS3, CBUS4

6 MHz Clock output.**

CBitBangI/O

CBUS0, CBUS1, CBUS2, CBUS3

CBUS bit bang mode option. Allows up to 4 of the CBUS

pins to be used as general purpose I/O. Configured

individually for CBUS0, CBUS1, CBUS2 and CBUS3 in the

internal EEPROM. A separate application note, AN232R-01,

available from FTDI website (www.ftdichip.com) describes

in more detail how to use CBUS bit bang mode.

BitBangWRn

CBUS0, CBUS1, CBUS2, CBUS3

Synchronous and asynchronous bit bang mode WR#

strobe output.

BitBangRDn

CBUS0, CBUS1, CBUS2, CBUS3

Synchronous and asynchronous bit bang mode RD# strobe

output.

Table 3.9 CBUS Configuration Control

* PWREN# must be used with a 10kΩ resistor pull up.

**When in USB suspend mode the outputs clocks are also suspended.

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