Document No.: FT_000060
FT4232H QUAD HIGH SPEED USB TO MULTIPURPOSE UART/MPSSE IC
Datasheet Version 2.09
Clearance No.: FTDI#78
3.4.2 FT4232H pins used in a Synchronous or Asynchronous Bit-Bang
Interface
The FT4232H channel A, B, C or channel D can be configured as a bit-bang interface. There are two types
of bit-bang modes: synchronous and asynchronous.
When configured in any bit-bang mode (synchronous or asynchronous), the pins used and the
descriptions of the signals are shown in Table 3.6
Channel
Number
Synchronous or Asynchronous Bit-Bang
Configuration Description
Pin Nos.
Name
Type
A
B
C
D
24,23,22,21
,
ADBUS[7:0]
I/O
Channel A, D7 to D0 bidirectional bit-bang data
Channel B, D7 to D0 bidirectional bit-bang data
19,18,17,16
34,33,32,30
,
BDBUS[7:0]
I/O
29,28,27,26
46,45,44,43
,
CDBUS[7:0]
DDBUS[7:0]
I/O
I/O
Channel C, D7 to D0 bidirectional bit-bang data
Channel D, D7 to D0 bidirectional bit-bang data
41,40,39,38
59,58,57,55
54,53,52,48
Table 3.6 Channel A,B,C and Channel D Synchronous or Asynchronous Bit-Bang Configured Pin
Descriptions
For a functional description of this mode, please refer to section 4.5 Synchronous and Asynchronous Bit-
Bang Interface Mode Description.
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13
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