Справочник Пользователя для National Instruments PCI-DIO-96
Chapter 6
Programming
©
National Instruments Corporation
6-17
PCI-DIO-96 User Manual
Figure 6-7. Control Word to Configure Port A as Mode 2 Bidirectional Data Bus
During a mode 2 data transfer, you can obtain the status of the
handshaking lines and interrupt signals by reading port C. The port C
status-word bit definitions for a mode 2 transfer are shown as follows.
handshaking lines and interrupt signals by reading port C. The port C
status-word bit definitions for a mode 2 transfer are shown as follows.
Port C
PC <2..0>
1 = Input
0 = Output
PC <2..0>
1 = Input
0 = Output
D7
D6
D5
D4
D3
D2
D1
D0
1
1
X
X
X
1/0
1/0
1/0
Port B
1 = Input
0 = Output
1 = Input
0 = Output
Group B Mode
0 = Mode 0
1 = Mode 1
0 = Mode 0
1 = Mode 1