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PD72042B Datasheet(PDF) 6 Page - Renesas Technology Corp |
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PD72042B Datasheet(HTML) 6 Page - Renesas Technology Corp |
6 / 92 page µPD72042B 4 Data Sheet S13990EJ3V0DS CONTENTS 1. PIN FUNCTIONS ............................................................................................................................. 6 1.1 PIN FUNCTIONS ..................................................................................................................................... 6 2. IEBus OPERATION ......................................................................................................................... 8 2.1 OVERVIEW .............................................................................................................................................. 8 2.2 IEBus COMMUNICATION PROTOCOL ................................................................................................ 9 2.2.1 Bus Mastership Determination (Arbitration) ............................................................................... 10 2.2.2 Communication Mode ................................................................................................................. 10 2.2.3 Communication Address ............................................................................................................. 11 2.2.4 Broadcast ..................................................................................................................................... 11 2.3 TRANSMISSION PROTOCOL ............................................................................................................... 11 2.4 TRANSMISSION DATA (CONTENTS OF THE DATA FIELD) ............................................................. 17 2.5 BIT FORMAT ........................................................................................................................................... 21 3. MICROCOMPUTER INTERFACE .................................................................................................. 22 3.1 TRANSFER METHOD ............................................................................................................................ 22 3.2 DATA TRANSFER FORMAT .................................................................................................................. 23 3.2.1 Three-Wire Data Transfer (SEL = 1) .......................................................................................... 23 3.2.2 Two-Wire Data Transfer (SEL = 0) ............................................................................................. 25 3.3 CONNECTION TO A MICROCOMPUTER ............................................................................................. 27 3.4 STANDBY MODE SETTING AND CANCELLATION ............................................................................ 28 3.5 RESET MODE SETTING AND CANCELLATION ................................................................................. 28 4. REGISTERS .................................................................................................................................... 29 5. EXAMPLE TIMINGS FOR COMMUNICATION .............................................................................. 59 6. EXAMPLE MICROCOMPUTER PROCESSING FLOW ................................................................ 67 6.1 COMMUNICATION FLAGS .................................................................................................................... 68 6.2 MAIN ROUTINE ...................................................................................................................................... 69 6.3 INTERRUPT ROUTINE ........................................................................................................................... 70 6.4 PROCESSING ROUTINES ..................................................................................................................... 72 6.4.1 µPD72042B Initial Setting Routine ............................................................................................. 72 6.4.2 Communication Flag Initialization Routine ................................................................................. 72 6.4.3 Command Processing Routine ................................................................................................... 73 6.4.4 Master Communication Processing Routine .............................................................................. 73 6.4.5 Slave Data Transmission Processing Routine ........................................................................... 77 6.4.6 Transmission Processing Routine .............................................................................................. 80 6.4.7 Reception Processing Routine ................................................................................................... 81 7. ELECTRICAL CHARACTERISTICS .............................................................................................. 82 8. PACKAGE DRAWING ..................................................................................................................... 86 |
Similar Part No. - PD72042B_15 |
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Similar Description - PD72042B_15 |
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