Chapter 3
Theory of Operation
© National Instruments Corporation
3-19
AT-MIO-16D User Manual
Mode 1
This mode transfers data that is synchronized by handshaking signals. Ports A and B use the eight
lines of Port C to generate or receive the handshake signals. This mode divides the ports into two
groups (Group A and Group B) and has the following features:
¥
Each group contains one 8-bit data port (Port A or Port B) and one 4-bit control/data port
(upper or lower nibble of Port C).
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The 8-bit data ports can be either input or output, both of which are latched.
¥
The 4-bit ports are used for control and status of the 8-bit data ports.
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Interrupt generation and enable and/or disable functions are available.
Mode 2
This mode can be used for communication over a bidirectional 8-bit bus. Handshaking signals are
used in a manner similar to Mode 1. Interrupt generation and enable and/or disable functions are
also available. Other features of this mode include the following:
¥
Used in Group A only (Port A and upper nibble of Port C)
¥
One 8-bit bidirectional port (Port A) and a 5-bit control status port (Port C)
¥
Latched inputs and outputs
Single Bit Set/Reset Feature
Any of the eight bits of Port C can be set or reset with one control word. This feature generates
status and control for Port A and Port B when operating in Mode 1 or Mode 2.
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