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參數(shù)資料
| 型號(hào)： | FT232R |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Incorporating Clock Generator Output and FTDIChip-ID Security Dongle |
| 中文描述： | 納入時(shí)鐘發(fā)生器輸出和FTDIChip標(biāo)識(shí)安全適配器 |
| 文件頁數(shù)： | 11/29頁 |
| 文件大?。?/td> | 471K |
| 代理商： | FT232R |
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FT232R USB UART I.C. Datasheet Version 1.04
Future Technology Devices International Ltd. 2005
Page 11
4.5 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 are all configured in the internal EEPROM using the utility software MPROG,
which can be downloaded from the
FTDI website
. The default configuration is described in
Section 10
.
Table 3 - CBUS Signal Options
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
Goes low after the device is configured by USB, then high during
USB suspend. 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# pin in this way.
TXLED#
CBUS0, CBUS1, CBUS2, CBUS3, CBUS4
Transmit data LED drive - pulses low when transmitting data via
USB. See
Section 9
for more details.
RXLED#
CBUS0, CBUS1, CBUS2, CBUS3, CBUS4
Receive data LED drive - pulses low when receiving data via USB.
See
Section 9
for more details.
TX&RXLED#
CBUS0, CBUS1, CBUS2, CBUS3, CBUS4
LED drive - pulses low when transmitting or receiving data via
USB. See
Section 9
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 I.C. in USB to RS232
converter designs.
CLK48
CBUS0, CBUS1, CBUS2, CBUS3, CBUS4
48MHz Clock output.
CLK24
CBUS0, CBUS1, CBUS2, CBUS3, CBUS4
24MHz Clock output.
CLK12
CBUS0, CBUS1, CBUS2, CBUS3, CBUS4
12MHz Clock output.
CLK6
CBUS0, CBUS1, CBUS2, CBUS3, CBUS4
6MHz 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 will describe 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
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