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FT2232D Datasheet(PDF) 39 Page - Future Technology Devices International Ltd.

Part # FT2232D
Description  Dual USB UART/FIFO I.C.
PDF  56 Pages
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Manufacturer  FTDI [Future Technology Devices International Ltd.]
Direct Link  http://www.ftdichip.com
Logo FTDI - Future Technology Devices International Ltd.

FT2232D Datasheet(HTML) 39 Page - Future Technology Devices International Ltd.

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DS2232D Version 0.91
© Future Technology Devices International Ltd. 2006 Page 39 of 51
FT2232D Dual USB UART / FIFO I.C.
Synchronous Bit-Bang Mode
With Synchronous Bit-Bang mode data will only be sent out by the FT2232D if there is space in the device for data to
be read from the pins. This Synchronous Bit-Bang mode will read the data bus pins first, before it sends out the byte
that has just been transmitted. It is therefore 1 byte behind the output, and so to read the inputs for the byte that you
have just sent, another byte must be sent.
For example :-
(1) Pins start at 0xFF
Send 0x55,0xAA
Pins go to 0x55 and then to 0xAA
Data read = 0xFF,0x55
(2) Pins start at 0xFF
Send 0x55,0xAA,0xAA
(repeat the last byte sent)
Pins go to 0x55 and then to 0xAA
Data read = 0xFF,0x55,0xAA



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