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CHAPTER 2 PIN FUNCTIONS2.2.9 VPP (µPD78F9076 only)A high voltage should be applied to this pin when the flash memory programming mode is set and when theprogram is written or verified.Handle this pin in either of the following ways.• Connect a 10 kΩ pull-down resistor to the pin.• Provide a jumper on the board so that the pin is connected to a dedicated flash programmer in programmingmode and to VSS during normal operation.If there is a long wiring length between the VPP pin and the VSS pin or external noise superimposed on the VPP pin,the user program may not run correctly.2.2.10 IC (mask ROM version only)The IC (Internally Connected) pin is used to set the µPD789071, 789072, and 789074 to test mode beforeshipment. In normal operation mode, directly connect this pin to the VSS pin with as short a wiring length as possible.If a potential difference is generated between the IC pin and the VSS pin due to a long wiring length between thesepins or external noise superimposed on the IC pin, the user program may not run correctly.• Directly connect the IC pin to the VSS pin.VSSICKeep short34User’s Manual U14801EJ3V1<strong>UD</strong>
CHAPTER 2 PIN FUNCTIONS2.3 Pin I/O Circuits and Recommended Connection of Unused PinsThe I/O circuit type of each pin and recommended connection of unused pins are shown in Table 2-1.For the I/O circuit configuration of each type, refer to Figure 3-1.Table 2-1. Types of Pin I/O Circuits and Recommended Connection of Unused PinsPin Name I/O Circuit Type I/O Recommended Connection of Unused PinsP00 to P075-AI/OInput:Connect to VDD or VSS via a resistor.P10 to P15Output:Leave open.P20/SCK20/ASCK208-AP21/SO20/TxD20P22/SI20/RxD20P23/SS20P24/INTP0Input:Connect to VSS via a resistor.P25/INTP1Output:Leave open.P26/INTP2/CPT90P27/TI80/TO80Input:Connect to VDD or VSS via a resistor.P30/TO905-AOutput:Leave open.P31/BZO90RESET 2 Input −IC − − Connect directly to VSS.VPPConnect to a 10 kΩ pull-down resistor or directly to VSS.User’s Manual U14801EJ3V1<strong>UD</strong> 35
Page 1 and 2: User’s ManualµPD789074 Subseries
Page 3 and 4: NOTES FOR CMOS DEVICES1VOLTAGE APPL
Page 5 and 6: Regional InformationSome informatio
Page 7 and 8: INTRODUCTIONReadersPurposeOrganizat
Page 9: Documents for Flash Memory WritingP
Page 13 and 14: CHAPTER 11 STANDBY FUNCTION .......
Page 15 and 16: LIST OF FIGURES (1/3)Figure No. Tit
Page 17 and 18: LIST OF FIGURES (3/3)Figure No. Tit
Page 19 and 20: LIST OF TABLES (2/2)Table No. Title
Page 21 and 22: CHAPTER 1 GENERAL1.2 Features• RO
Page 23 and 24: CHAPTER 1 GENERAL1.6 Pin Configurat
Page 25 and 26: CHAPTER 1 GENERALThe major function
Page 27 and 28: CHAPTER 1 GENERAL1.8 Block DiagramT
Page 29 and 30: CHAPTER 1 GENERAL1.10 Differences B
Page 31 and 32: CHAPTER 2 PIN FUNCTIONS(2) Non-port
Page 33: CHAPTER 2 PIN FUNCTIONS(h) RxD20, T
Page 37 and 38: CHAPTER 3 CPU ARCHITECTURE3.1 Memor
Page 39 and 40: CHAPTER 3 CPU ARCHITECTUREFigure 3-
Page 41 and 42: CHAPTER 3 CPU ARCHITECTURE3.1.1 Int
Page 47 and 48: CHAPTER 3 CPU ARCHITECTURE(a) Inter
Page 49 and 50: CHAPTER 3 CPU ARCHITECTURE3.2.2 Gen
Page 51 and 52: CHAPTER 3 CPU ARCHITECTURETable 3-3
Page 53 and 54: CHAPTER 3 CPU ARCHITECTURE3.3 Instr
Page 55 and 56: CHAPTER 3 CPU ARCHITECTURE3.3.3 Tab
Page 57 and 58: CHAPTER 3 CPU ARCHITECTURE3.4.2 Sho
Page 59 and 60: CHAPTER 3 CPU ARCHITECTURE3.4.4 Reg
Page 61 and 62: CHAPTER 3 CPU ARCHITECTURE3.4.6 Bas
Page 63 and 64: CHAPTER 4 PORT FUNCTIONSTable 4-1.
Page 65 and 66: CHAPTER 4 PORT FUNCTIONS4.2.2 Port
Page 67 and 68: CHAPTER 4 PORT FUNCTIONSFigure 4-5.
Page 69 and 70: CHAPTER 4 PORT FUNCTIONSFigure 4-7.
Page 71 and 72: CHAPTER 4 PORT FUNCTIONS4.3 Port Fu
Page 73 and 74: CHAPTER 4 PORT FUNCTIONS(3) Pull-up
Page 75 and 76: CHAPTER 5 CLOCK GENERATOR5.1 Clock
Page 77 and 78: CHAPTER 5 CLOCK GENERATOR5.4 System
Page 79 and 80: CHAPTER 5 CLOCK GENERATORFigure 5-4
Page 81 and 82: CHAPTER 5 CLOCK GENERATOR5.6 Changi
Page 83 and 84: Figure 6-1. Block Diagram of 16-Bit
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CHAPTER 6 16-BIT TIMER 906.3 Contro
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CHAPTER 6 16-BIT TIMER 90(2) Buzzer
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CHAPTER 6 16-BIT TIMER 906.4 Operat
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CHAPTER 6 16-BIT TIMER 906.4.2 Oper
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CHAPTER 6 16-BIT TIMER 906.4.4 16-b
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CHAPTER 6 16-BIT TIMER 906.5 Notes
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CHAPTER 7 8-BIT TIMER/EVENT COUNTER
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CHAPTER 8 WATCHDOG TIMER8.1 Watchdo
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CHAPTER 9 SERIAL INTERFACE 209.1 Fu
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Figure 9-2. Block Diagram of Baud R
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CHAPTER 9 SERIAL INTERFACE 209.3 Co
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CHAPTER 9 SERIAL INTERFACE 20(1) Op
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CHAPTER 9 SERIAL INTERFACE 20(4) Ba
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CHAPTER 9 SERIAL INTERFACE 20(b) Ge
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CHAPTER 9 SERIAL INTERFACE 209.4.2
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CHAPTER 9 SERIAL INTERFACE 20(b) As
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CHAPTER 9 SERIAL INTERFACE 20(d) Ba
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CHAPTER 9 SERIAL INTERFACE 20(2) Co
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CHAPTER 9 SERIAL INTERFACE 20(c) Tr
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CHAPTER 9 SERIAL INTERFACE 20(e) Re
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CHAPTER 9 SERIAL INTERFACE 20(3) Ca
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CHAPTER 9 SERIAL INTERFACE 20(b) As
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CHAPTER 9 SERIAL INTERFACE 20(2) Co
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CHAPTER 9 SERIAL INTERFACE 20Figure
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CHAPTER 10 INTERRUPT FUNCTIONSTable
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CHAPTER 10 INTERRUPT FUNCTIONS10.3
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CHAPTER 10 INTERRUPT FUNCTIONS(2) I
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CHAPTER 10 INTERRUPT FUNCTIONS(4) P
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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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