figure 9-1 general parallel i/o example peter spasov microcontroller technology: the 68hc11, fourth...

FIGURE 9-1 General Parallel I/O Example

Peter SpasovMicrocontroller Technology: The 68HC11, Fourth Edition

Copyright ©2002 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458

All rights reserved.

FIGURE 9-2 Seven-Segment Display




FIGURE 9-3 Seven-Segment LED Display Connections




FIGURE 9-4 Seven-Segment Code Examples




FIGURE 9-5 Parallel Output to Seven-Segment Displays




FIGURE 9-6 Liquid-Crystal Display




FIGURE 9-7 Example of a 5 x 8 Dot Matrix LCD Display Controlled by an MC145000 LCD Driver




FIGURE 9-8 Sample LCD Excitation Waveforms Based on MC145000 Driver IC




FIGURE 9-9 3 x 4 Matrix Keyboard (Telephone Format)




FIGURE 9-10 Parallel I/O with Keyboard. Also connect PC7 high using a pull-up resistor.




FIGURE 9-11 2-out-of-7 Keyboard Decoding Using Port C




FIGURE 9-12 Using Hardware Decoders with Keyboard




FIGURE 9-13 Strobed I/O




FIGURE 9-14 Parallel I/O Control Register




FIGURE 9-15 Input Handshaking




FIGURE 9-16 Input Handshake Timing Diagrams




FIGURE 9-17 Output Handshaking




FIGURE 9-18 Output Handshake Timing Diagrams




FIGURE 9-19 Centronics Parallel Interface Timing Diagram




FIGURE 9-20 Centronics Parallel Interface Pin Assignments




FIGURE 9-21 IEEE-488 Handshaking Timing Diagram




FIGURE 9-22 Open-Drain Outputs for Wired-AND Application




FIGURE 9-23 Command and Data Phases of a SCSI Bus




figure 9-1 general parallel i/o example peter spasov microcontroller technology: the 68hc11, fourth...

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