Omega-engineering IOP-241 Instrukcja Użytkownika Strona 30
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Oceniono. / 5. Na podstawie oceny klientów
(2) External Interrupt Source
(a) The following must be programmed:
(i) Interrupt source enabled via Interrupt Mode Control Register.
(ii) Mode selected via Interrupt Mode Control Register.
(b) Interrupt generated if ExtIntStat of Interrupt Mode Control Register is '1'.
(c) '1' in ExtIntStatus is reset to '0' if the following two requirements are satisfied:
(i) Interrupt acknowledged by writing ExtIntAck with '1'.
(ii) Condition which caused interrupt is no longer present.
5.9 Summary of Input/Output Options
Each of the three ports (Port A, Port B, Port C) may be configured in one of three manners:
(1) PORT USED AS AN OUTPUT
(a) Write a '1' to the appropriate bits of the latch in order to turn 'off' the output
module.
(b) Write a '0' to the appropriate bits of the latch in order to turn 'on' the output
module.
(2) PORT USED AS AN INPUT
(a) Writing a '1' to all the bits of the latch will allow all the channels of the port to be
read as inputs. (Writing a '0' to any bits of the latch will 'mask' those bits. Those
bits will always be read as a '0').
(3) PORT USED AS INPUT AND OUTPUT
If a port is to be used so that some channels are inputs and some channels are outputs, it must
be insured that the channels to be used as inputs are initialized as inputs. This is done by
writing a '1' to the bits of the data port control register representing the I/O channels which
are to be used as inputs anytime the port is written.
(a) The channels which are to be inputs should always be written with a '1' and
never written with a '0'.
(b) The channels which are to be outputs should be written with the appropriate
value ('0' or '1').
(c) The channels which are latched with a '0' will always be '0' when read (they are
'masked' from input).
IOP-241 Users Manual 30
- Users Manual 1
- WARRANTY/DISCLAIMER 2
- RETURN REQUESTS/INQUIRIES 2
- Declaration of Conformity 3
- http://www.omega.com 4
- Table of Contents 6
- List of Figures and Tables 8
- 1. Introduction 9
- IMPORTANT: 10
- 2.2 IOP-241 Enabler for DOS 15
- 4. Theory of Operation 23
- 5. Register Descriptions 25
- ChanCIntAck 29
- DescriptionNameBit 29
- 5.10 Programming Example 31
- 6. External Connections 32
- 7. Optional Accessories 33
- 8. Specifications 35
- IOP-241 Users Manual 36
- Version 2.30 36
- January 25, 1999 36
- Part No. 940-0077-230 36
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