ft232hq Future Technology Devices International Ltd., ft232hq Datasheet - Page 16

• Manufacturer Part Number: ft232hq
• Description: Ft232h Single Channel Hi- Speed Usb To Multipurpose Uart/fifo Ic
• Manufacturer: Future Technology Devices International Ltd.

3.5.4 FT232H can be configured as a Synchronous or Asynchronous Bit-Bang
Bit-bang mode is an FTDI FT232H device mode that changes the 8 IO lines into an 8 bit bi-directional
data bus. This mode is enabled by sending a software command (Set Bit Mode option) to the FTDI driver
When configured in any bit-bang mode, the pins used and the descriptions of the signals are shown in
Table 3.9
Table 3.9 Synchronous or Asynchronous Bit-Bang Configured Pin Descriptions
For functional description of this mode, please refer to section 4.6
13,14,15,16,17,
Pin No.
18,19,20
Interface.
25
26
28
Copyright © 2011 Future Technology Devices International Limited
ADBUS[7:0]
WRSTB#
RDSTB#
FT232H SINGLE CHANNEL HI-SPEED USB TO MULTIPURPOSE UART/FIFO IC
Name
SIWUA
OUTPUT
OUTPUT
Type
INPUT
I/O
D7 to D0 bidirectional Bit-Bang parallel I/O
data pins
Write strobe, active low output indicates
when new data has been written to the I/O
pins from the Host PC (via the USB
interface).
Read strobe, this output rising edge indicates
when data has been read from the parallel
I/O pins and sent to the Host PC (via the USB
interface).
The Send Immediate / WakeUp signal
combines two functions on a single pin. If
USB is in suspend mode (PWREN# = 1) and
remote wakeup is enabled in the EEPROM,
strobing this pin low will cause the device to
request a resume on the USB Bus. Normally,
this can be used to wake up the Host PC.
During normal operation (PWREN# = 0), if
this pin is strobed low any data in the device
TX buffer will be sent out over USB on the
next Bulk-IN request from the drivers
regardless of the pending packet size. This
can be used to optimize USB transfer speed
for some applications. Tie this pin to VCCIO if
not used.
Configuration Description
Document No.: FT_000288
Clearance No.: FTDI #199
Datasheet Version 1.0
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