National Instruments 320174B-01 用户手册
Contents
Lab-NB User Manual vi © National Instruments Corporation
Chapter 3
Theory
Theory
of
Operation
........................................................................................................... 3-1
Functional Overview...................................................................................................... 3-1
NuBus Interface Circuitry.............................................................................................. 3-2
Analog
NuBus Interface Circuitry.............................................................................................. 3-2
Analog
Input
and
DAQ
Circuitry................................................................................... 3-3
Analog Input Circuitry....................................................................................... 3-4
DAQ
DAQ
Timing
Circuitry....................................................................................... 3-4
Single-Channel Data Acquisition........................................................... 3-5
Multichannel (Scanned) Data Acquisition............................................. 3-5
DAQ Rates ............................................................................................. 3-6
Multichannel (Scanned) Data Acquisition............................................. 3-5
DAQ Rates ............................................................................................. 3-6
Analog Output Circuitry ................................................................................................ 3-7
Digital I/O Circuitry....................................................................................................... 3-9
Timing I/O Circuitry ...................................................................................................... 3-10
Digital I/O Circuitry....................................................................................................... 3-9
Timing I/O Circuitry ...................................................................................................... 3-10
Chapter 4
Register-Level Programming
Register-Level Programming
......................................................................................... 4-1
Register Access.............................................................................................................. 4-1
Slot
Address
Space............................................................................................. 4-1
Register Map...................................................................................................... 4-2
Register Sizes..................................................................................................... 4-4
Register Sizes..................................................................................................... 4-4
Register
Descriptions ..................................................................................................... 4-4
Register Description Format .............................................................................. 4-4
Analog Input Register Group............................................................................. 4-5
Analog Input Register Group............................................................................. 4-5
A/D Configuration Register................................................................... 4-6
Status Register........................................................................................ 4-9
A/D FIFO Register................................................................................. 4-10
A/D Clear Register................................................................................. 4-12
Status Register........................................................................................ 4-9
A/D FIFO Register................................................................................. 4-10
A/D Clear Register................................................................................. 4-12
Analog Output Register Group .......................................................................... 4-13
DAC Configuration Register ................................................................. 4-14
DAC0 and DAC1 Data Registers........................................................... 4-15
DAC0 and DAC1 Data Registers........................................................... 4-15
8253 Counter/Timer Register Groups................................................................ 4-16
Counter A0 Data Register...................................................................... 4-17
Counter A1 Data Register...................................................................... 4-18
Counter A2 Data Register...................................................................... 4-19
Counter A Mode Register ...................................................................... 4-20
Counter B0 Data Register ...................................................................... 4-21
Counter B1 Data Register ...................................................................... 4-22
Counter B2 Data Register ...................................................................... 4-23
Counter B Mode Register ...................................................................... 4-24
Counter A1 Data Register...................................................................... 4-18
Counter A2 Data Register...................................................................... 4-19
Counter A Mode Register ...................................................................... 4-20
Counter B0 Data Register ...................................................................... 4-21
Counter B1 Data Register ...................................................................... 4-22
Counter B2 Data Register ...................................................................... 4-23
Counter B Mode Register ...................................................................... 4-24
82C55A Digital I/O Register Group .................................................................. 4-25
Port A Register....................................................................................... 4-26
Port B Register....................................................................................... 4-27
Port C Register....................................................................................... 4-28
Digital
Port B Register....................................................................................... 4-27
Port C Register....................................................................................... 4-28
Digital
Control
Register......................................................................... 4-29
Interrupt
Control
Register
Group....................................................................... 4-30
Interrupt Control Register ...................................................................... 4-31
Interrupt Status Register......................................................................... 4-33
Timer Interrupt Clear Register............................................................... 4-34
Interrupt Status Register......................................................................... 4-33
Timer Interrupt Clear Register............................................................... 4-34
Configuration EPROM .................................................................................................. 4-35