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SERIES AP471 ACROPACK
USER
’S MANUAL
Acromag, Inc. Tel: 248-295-0310
- 28 -
http://www.acromag.com
- 28 -
www.acromag.com
data contention between the built-in output circuitry and the
devices driving these inputs. Write 000FH to the Write Mask
Register.
6.
(OPTIONAL) Write 01H to the Interrupt Enable Register to enable
interrupt request.
When a positive transition is detected, an interrupt will be generated
(if the event sense detection circuitry has been enabled and
Interrupt Enable bit 0=1).
Note that the state of the inputs (on/off) can be determined by
reading the corresponding I/O Registers. The event sense status can
only be determined by reading the corresponding Event
Pending/Clear Register. Remember, the event sense status is a flag
that is raised when a specific positive or negative transition has
occurred for a given input point, while the state refers to its current
level.
4.0 THEORY OF OPERATION
This section provides a description of the basic functionality of the circuitry
used on the board. Refer to the Block Diagram shown below as you review
this material.