National Instruments 3.21E+04 用户手册

Chapter 4     Signal Connections

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 National Instruments Corporation

4-53

AT-MIO/AI E Series User Manual

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AT-MIO-16DE-10 only

In addition to its function as a digital I/O port, digital port C, 
PC<0..7>, can also be used for handshaking when performing data 
transfers with ports A and B.  The signals assigned to port C depend 
on the mode in which it is programmed.  In mode 0, port C is 
considered two 4-bit I/O ports.  In modes 1 and 2, port C is used for 
status and handshaking signals with two or three additional I/O 
bits.  Table 4-5 summarizes the signal assignments of port C for 
each programmable mode.

Table 4-5.     Port C Signal Assignments

I/O

I/O

I/O

I/O

I/O

I/O

I/O

I/O

I/O

I/O

IBFA

STBA*

INTRA

STBB*

IBFBB

INTRB

OBFA*

ACKA*

I/O

I/O

INTRA

ACKB*

OBFB*

INTRB

OBFA*

ACKA*

IBFA

STBA*

INTRA

I/O

I/O

I/O

* Indicates that the signal is active low.