National Instruments PC-DIO-96 Manual Do Utilizador
Chapter 4
Register-Level Programming
© National Instruments Corporation
4-5
PC-DIO-96 User Manual
Register Description for the Interrupt Control Registers
There are two interrupt control registers on the PC-DIO-96. One of these registers has individual
enable bits for the two interrupt lines from each of the 82C55A devices. The other register has a
master interrupt enable bit and two bits for the timed interrupt circuitry. Of the latter two bits,
one bit enables counter interrupts, while the other selects counter 0 or counter 1. The bit maps
and signal definitions are listed as follows.
enable bits for the two interrupt lines from each of the 82C55A devices. The other register has a
master interrupt enable bit and two bits for the timed interrupt circuitry. Of the latter two bits,
one bit enables counter interrupts, while the other selects counter 0 or counter 1. The bit maps
and signal definitions are listed as follows.