Xycom XVME-560 Manual page 37

XVME-560
Manual
September, 1984
Random Channel Mode
3.7.1
In the Random Channel mode, a conversion will automatically start after a channel
number is written to the Channel/Gain register.
Procedure
Write the control word to the control register (base+8lH) specifying bits M1 and
1)
MO as 1 and 0.
Select the channel and gain by writing to the Channel/Gain register (base+85H).
2 )
This starts the A/D conversion.
3) Read the results of the conversion in the high byte (base+86H) and low byte
(base+87H). These two bytes can be read in any order when in the Random
Channel mode. A 16-bit read can also be performed.
3.7.2 Single Channel Mode
In the
Single Channel mode,
the selected channel after the low byte
Procedure
1)
Write the
control word
single channel
Select the channei and gain
2)
To initiate the first conversion,
3)
conversion by writing
Read the results of the conversion high byte
4)
or perform a 16-bit read. When
starts on that channel.,
3.7.3 Sequential Channel Mode
In the Sequential Channel mode, every time the lower eight bits of data are read
(base+87H) the channel number is incremented by one, and an A/D conversion is
started on the next channel (previous channel+l).
Procedure
1)
Write the control word (base+8lH) specifying mode bits Ml and MO as 0 and 1.
Specify the channel and gain by writing to the Channel/Gain register (base+85H).
2)
3 )
To initiate the first conversion, perform a dummy Read (base+87H) or force a
conversion by writing a logic "one" to bit 7 of the control register.
Read the results, high byte (base+86H) then low byte (base+87H), or perform a
4)
16-bit read. When the lower byte is read, an A/D conversion is initiated on the
next channel (previous channel+ 1).
the module will automatically start another conversion on
(base+87H)
that specifies bits Ml and MO as 0 and 0 for
(base+8lH)
mode.
by writing to
perform a "dummy" Read (base+87H) or force a
a
logic "one" to bit 7
the low byte is read, another A/D conversion
.
has been read.
Channel/Gain register(base+85H).
the
of the register.
control
(base+86H) then low byte (base+87H)