Chapter 3: Architecture
50
Latch configuration is a 16-bit word, two bits for each one of eight
sense inputs.
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
F R F R F R F R F R F R F R F R
F: 1 in this position, the inputs are sensitive to falling edge
R: 1 in this position, the inputs are sensitive to rising edge
Table 23: Digital Input Configuration Word
The Edge Detector and Latch Logic detect configured edges on the
digital input lines. A 8-bit latch register has 1 bit per input line. It is set
to “1” when the configured edge is detected. Additionally, the logic
fires an interrupt to the DSP to inform it when the configured
conditions are met.
If you set up a latch configuration to watch for edges on several lines,
the interrupt fires as soon as any of the selected conditions happen.
However, the interrupt will not be re-fired again until the user
application clears the bit. If a change is detected on another line, the
interrupt will re-fire. To recognize which line caused an interrupt you
have to read the digital input status (i.e. latch register).
Summary of Contents for PD2-MF
Page 5: ...Table of Contents iii Index 137 ...
Page 11: ...1 1 Introduction ...
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Page 19: ...9 2 Installation and Configuration ...
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Page 35: ...25 3 Architecture ...
Page 63: ...53 4 PowerDAQ Software Development Kit PD SDK ...
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Page 107: ...97 5 Calibration ...
Page 109: ...99 A Appendix A Specifications ...
Page 110: ...Appendix A Specifications 100 ...
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Page 113: ...103 B Appendix B Accessories ...
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Page 119: ...109 C Appendix C Application Notes ...
Page 125: ...115 D Appendix D Warranty ...
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Page 129: ...119 E Appendix E Glossary ...
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