Manual Number: 00650-014-4
Page 4-2
AD12-8 Manual
IEN:
This bit enables/disables AD12-8 generated interrupts. 1 = enabled, 0 =
disabled.
MA0-MA2:
These bits select the analog mutiplexer channel address on the AD12-8 card
(Channels 0 through 7).
Base + 3 Write:
Read or write the control register #2.
%
%
%
%
%
%
%
%
23
23
23
23
86(5 *1
*1
*1
0P0-OP3:
These bits correspond to four general-purpose digital output lines. These
bits are available on both control registers #1 and #2, in order to save
program execution time. These lines can be used for external control
functions such as selecting inputs from the AT16-P, or LVDT8-P sub-
multiplexer cards.
USER:
This bit is available for use as a digital output bit.
GN0-GN2:
These bits correspond to three general purpose digital output lines whose
primary purpose is to select one of eight gains on the AT16-P analog input
expansion card.
Status Register
The Status register provides information about the operation of the card.
Base + 2 Read:
Read the card status.
%
%
%
%
%
%
%
%
(2&
*1
*1
*1
,54
0$ 0$ 0$
EOC:
End of conversion. If EOC = 1, an A/D conversion is underway. If EOC
is 0, then the A/D data registers contain valid data from the previous
conversion and the A/D is ready to perform the next conversion.
GN0-GN2:
These bits correspond to three general purpose digital output lines whose
primary purpose is to define one of eight gains on AT16-P sub-multiplexer
cards.
IRQ:
After generation of an interrupt, the AD12-8 card sets this bit high(1). It is
reset to state 0 by a computer reset, or a write to either of the control
registers, or the beginning of an A/D conversion.,
MA2-MA0:
These bits define the analog multiplexer channel address on the AD12-8
card (channels 0 through 7).
