Index
©
National Instruments Corporation
I-5
PC-DIO-24/PnP User Manual
power requirements, A-2
programming. See register-level
programming.
R
RD* signal
description (table), 3-11
mode 1 input timing, 3-12
mode 2 bidirectional timing, 3-14
register-level programming, C-1 to C-23
82C55A operation, C-2
compared with other software
options, 1-4
interrupt handling, C-22 to C-23
interrupt programming examples,
C-20 to C-22
mode 0 basic I/O, C-9 to C-11
configurations (table), C-9 to C-10
overview, C-8
programming example, C-10 to C-11
mode 1 strobed input, C-11 to C-14
control words (figures), C-11 to C-12
Port C pin assignments (figure), C-13
Port C status-word bit definitions,
C-12 to C-13
programming example, C-13 to C-14
mode 1 strobed output, C-14 to C-17
control words written to CNFG
register (figure), C-14
Port C pin assignments (figure), C-16
Port C status-word bit definitions,
C-15
programming example, C-16 to C-17
mode 2 bidirectional bus, C-17 to C-20
control word written to CNFG
Register (figure), C-17
Port C pin assignments (figure), C-19
Port C status-word bit definitions,
C-18
programming example, C-19 to C-20
overview, C-1 to C-2
register descriptions, C-3 to C-7
82C55A, C-3 to C-5
control word formats (figure), C-4
interrupt control registers, C-5 to C-7
Port C set/reset control words
(table), C-5
register map, C-3
requirements for getting started, 1-2
S
self-resetting fuse for +5 V signal, 3-7
signal connections
digital I/O power-up state selection,
3-7 to 3-10
high DIO power-up state, 3-7 to 3-8
low DIO power-up state, 3-9 to 3-10
digital I/O signal connections, 3-4 to 3-6
input specifications (referenced to
GND), 3-4
output specifications (referenced to
GND), 3-5
typical digital I/O applications
(figure), 3-6
I/O connector pin assignments
(figure), 3-2
Port C pin assignments
description, 3-3
signal assignments (table), 3-4
power connections, 3-7
signal descriptions (table), 3-3
timing specifications, 3-10 to 3-14
mode 1 input timing, 3-12
mode 1 output timing, 3-13
mode 2 bidirectional timing, 3-14
signals (table), 3-10 to 3-11
single bit set/reset feature
overview, C-9
Port C set/reset control words (table), C-5
