uPD789074 Subseries 8-Bit Single-Chip Microcontrollers UD - Home

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CHAPTER 8 WATCHDOG TIMER8.2 Watchdog Timer ConfigurationThe watchdog timer includes the following hardware.Table 8-3. Configuration of Watchdog TimerItemControl registersWatchdog timer clock selection register (WDCS)Watchdog timer mode register (WDTM)ConfigurationFigure 8-1. Block Diagram of Watchdog TimerInternal busfXPrescalerWDTMKfX fX fX2 6 2 8WDTIFINTWDTMaskableinterrupt request2 4 RUN2 10 3Selector7-bit counterClearControllerRESETINTWDTNon-maskableinterrupt requestWatchdog timer clock selectionregister 2 (WDCS)WDCS2 WDCS1 WDCS0WDTM4 WDTM3Watchdog timer mode register (WDTM)Internal bus110User’s Manual U14801EJ3V1<strong>UD</strong>
CHAPTER 8 WATCHDOG TIMER8.3 Watchdog Timer Control RegistersThe following two registers are used to control the watchdog timer.• Watchdog timer clock selection register (WDCS)• Watchdog timer mode register (WDTM)(1) Watchdog timer clock selection register (WDCS)This register sets the watchdog timer count clock.WDCS is set with an 8-bit memory manipulation instruction.RESET input clears WDCS to 00H.Figure 8-2. Format of Watchdog Timer Clock Selection RegisterSymbol 7 6 5 4 3 2 1 0 Address After reset R/WWDCS0 0 0 0 0 WDCS2 WDCS1 WDCS0FF42H 00H R/WWDCS2WDCS1WDCS0Count clock selectionInterval timeAt fX = 10.0 MHzoperation NoteAt fX = 5.0 MHzoperationAt fX = 10.0 MHzoperation NoteAt fX = 5.0 MHzoperation0002 4 /fX625 kHz313 kHz2 11 /fX205 µ s410 µ s0102 6 /fX156 kHz78.1 kHz2 13 /fX819 µ s1.64 ms1002 8 /fX39.1 kHz19.5 kHz2 15 /fX3.28 ms6.55 ms1102 10 /fX9.77 kHz4.88 kHz2 17 /fX13.1 ms26.2 msOther than aboveSetting prohibitedNote Expanded-specification products only.RemarkfX: System clock oscillation frequencyUser’s Manual U14801EJ3V1<strong>UD</strong> 111
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User’s ManualµPD789074 Subseries
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NOTES FOR CMOS DEVICES1VOLTAGE APPL
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Regional InformationSome informatio
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INTRODUCTIONReadersPurposeOrganizat
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Documents for Flash Memory WritingP
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CHAPTER 11 STANDBY FUNCTION .......
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LIST OF FIGURES (1/3)Figure No. Tit
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LIST OF FIGURES (3/3)Figure No. Tit
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LIST OF TABLES (2/2)Table No. Title
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CHAPTER 1 GENERAL1.2 Features• RO
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CHAPTER 1 GENERAL1.6 Pin Configurat
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CHAPTER 1 GENERALThe major function
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CHAPTER 1 GENERAL1.8 Block DiagramT
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CHAPTER 1 GENERAL1.10 Differences B
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CHAPTER 2 PIN FUNCTIONS(2) Non-port
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CHAPTER 2 PIN FUNCTIONS(h) RxD20, T
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CHAPTER 2 PIN FUNCTIONS2.3 Pin I/O
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CHAPTER 3 CPU ARCHITECTURE3.1 Memor
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CHAPTER 3 CPU ARCHITECTUREFigure 3-
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CHAPTER 3 CPU ARCHITECTURE3.1.1 Int
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CHAPTER 3 CPU ARCHITECTURE(a) Inter
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CHAPTER 3 CPU ARCHITECTURE3.2.2 Gen
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CHAPTER 3 CPU ARCHITECTURETable 3-3
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CHAPTER 3 CPU ARCHITECTURE3.3 Instr
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CHAPTER 3 CPU ARCHITECTURE3.3.3 Tab
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CHAPTER 3 CPU ARCHITECTURE3.4.2 Sho
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Page 63 and 64: CHAPTER 4 PORT FUNCTIONSTable 4-1.
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Page 75 and 76: CHAPTER 5 CLOCK GENERATOR5.1 Clock
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Page 83 and 84: Figure 6-1. Block Diagram of 16-Bit
Page 85 and 86: CHAPTER 6 16-BIT TIMER 906.3 Contro
Page 87 and 88: CHAPTER 6 16-BIT TIMER 90(2) Buzzer
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Page 97 and 98: CHAPTER 7 8-BIT TIMER/EVENT COUNTER
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CHAPTER 10 INTERRUPT FUNCTIONSFigur
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CHAPTER 10 INTERRUPT FUNCTIONSFigur
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CHAPTER 11 STANDBY FUNCTION11.1 Sta
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CHAPTER 11 STANDBY FUNCTION11.2 Ope
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CHAPTER 11 STANDBY FUNCTION11.2.2 S
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CHAPTER 12 RESET FUNCTIONThe follow
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CHAPTER 12 RESET FUNCTIONTable 12-1
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CHAPTER 13 µPD78F907613.1 Flash Me
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CHAPTER 13 µPD78F9076Figure 13-3.
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CHAPTER 13 µPD78F907613.1.3 On-boa
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CHAPTER 13 µPD78F9076When the rese
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CHAPTER 13 µPD78F9076Figure 13-9.
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CHAPTER 14 INSTRUCTION SET OVERVIEW
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CHAPTER 15 ELECTRICAL SPECIFICATION
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CHAPTER 18 RECOMMENDED SOLDERING CO
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APPENDIX A DEVELOPMENT TOOLSThe fol
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APPENDIX A DEVELOPMENT TOOLSA.1 Sof
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APPENDIX A DEVELOPMENT TOOLSA.4 Fla
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APPENDIX B NOTES ON TARGET SYSTEM D
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APPENDIX C REGISTER INDEXC.1 Regist
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APPENDIX C REGISTER INDEXC.2 Regist
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APPENDIX D REVISION HISTORYThe foll
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uPD789074 Subseries 8-Bit Single-Chip Microcontrollers UD - Home

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