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CHAPTER 7 8-BIT TIMER/EVENT COUNTER 80(2) Port mode register 2 (PM2)PM2 specifies whether each bit of port 2 is used for input or output.To use the TO80/P27/TI80 pin for timer output, the PM27 and P27 output latch must be reset to 0.To use the TO80/P27/TI80 pin for timer input, PM27 must be set to 1.PM2 is set with a 1-bit or 8-bit memory manipulation instruction.RESET input sets PM2 to FFH.Figure 7-3. Format of Port Mode Register 2Symbol 7 6 5 4 3 2 1 0 Address After reset R/WPM2PM27 PM26 PM25 PM24 PM23 PM22 PM21 PM20FF22H FFH R/WPM2n01Output mode (output buffer on)Input mode (output buffer off)P2n pin input/output mode selection (n = 0 to 5)100User’s Manual U14801EJ3V1UD
CHAPTER 7 8-BIT TIMER/EVENT COUNTER 807.4 Operation of 8-Bit Timer/Event Counter 807.4.1 Operation as interval timerThe interval timer repeatedly generates an interrupt at a time interval specified by the count value preset in 8-bitcompare register 80 (CR80).To operate 8-bit timer/event counter 80 as an interval timer, settings must be made in the following sequence. Disable operation of 8-bit timer counter 80 (TM80) (TCE80 (bit 7 of 8-bit timer mode control register 80(TMC80)) = 0). Set the count clock of 8-bit timer/event counter 80 (see Table 7-4). Set a count value in CR80. Enable the operation of TM80 (TCE80 = 1).When the count value of 8-bit timer counter 80 (TM80) matches the value set in CR80, TM80 is cleared to 0 andcontinues counting. At the same time, an interrupt request signal (INTTM80) is generated.Table 7-4 shows the interval time, and Figure 7-4 shows the timing of the interval timer operation.Cautions 1. Stop the timer operation before rewriting CR80. If CR80 is rewritten while the timeroperation is enabled, a match signal may be generated immediately at the point of rewrite(an interrupt request will be generated if interrupts are enabled).2. If setting the count clock to TMC80 and enabling the operation of TM80 are performed at thesame time with an 8-bit memory manipulation instruction, the error one cycle after the timerhas been started may exceed one clock. To use 8-bit timer/event counter 80 as an intervaltimer, therefore, make the settings in the above sequence.Table 7-4. Interval Time of 8-Bit Timer/Event Counter 80TCL801 TCL800 Minimum Interval Time Maximum Interval Time ResolutionAt fX = 10.0 MHzOperation NoteAt fX = 5.0 MHzOperationAt fX = 10.0 MHzOperation NoteAt fX = 5.0 MHzOperationAt fX = 10.0 MHzOperation NoteAt fX = 5.0 MHzOperation0 0 1/fX 100 ns 200 ns 2 8 /fX 25.6 µs 51.2 µs 1/fX 100 ns 200 ns0 1 2 8 /fX 25.6 µs 51.2 µs 2 16 /fX 6.55 ms 13.1 ms 2 8 /fX 25.6 µs 51.2 µs1 0 TI80 input cycle 2 8 × TI80 input cycle TI80 input edge cycle1 1 TI80 input cycle 2 8 × TI80 input cycle TI80 input edge cycleNote Expanded-specification products only.RemarkfX: System clock oscillation frequencyUser’s Manual U14801EJ3V1UD 101
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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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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 79 and 80: CHAPTER 5 CLOCK GENERATORFigure 5-4
Page 81 and 82: CHAPTER 5 CLOCK GENERATOR5.6 Changi
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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 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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