CHAPTER 3 METHODOLOGY 3.1 Overview The Water Monitoring ...

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AC CharacteristicsUnder operating conditions, load capacitance for Port 0, ALE/PROG, and PSEN = 100 pF; load capacitance for all otheroutputs = 80 pF.External Program and Data Memory Characteristics12 MHz Oscillator Variable OscillatorSymbolParameterMin Max Min MaxUnits1/t CLCL Oscillator Frequency 0 33 MHzt LHLL ALE Pulse Width 127 2t CLCL -40 nst AVLL Address Valid to ALE Low 43 t CLCL -25 nst LLAX Address Hold After ALE Low 48 t CLCL -25 nst LLIV ALE Low to Valid Instruction In 233 4t CLCL -65 nst LLPL ALE Low to PSEN Low 43 t CLCL -25 nst PLPH PSEN Pulse Width 205 3t CLCL -45 nst PLIV PSEN Low to Valid Instruction In 145 3t CLCL -60 nst PXIX Input Instruction Hold After PSEN 0 0 nst PXIZ Input Instruction Float After PSEN 59 t CLCL -25 nst PXAV PSEN to Address Valid 75 t CLCL -8 nst AVIV Address to Valid Instruction In 312 5t CLCL -80 nst PLAZ PSEN Low to Address Float 10 10 nst RLRH RD Pulse Width 400 6t CLCL -100 nst WLWH WR Pulse Width 400 6t CLCL -100 nst RLDV RD Low to Valid Data In 252 5t CLCL -90 nst RHDX Data Hold After RD 0 0 nst RHDZ Data Float After RD 97 2t CLCL -28 nst LLDV ALE Low to Valid Data In 517 8t CLCL -150 nst AVDV Address to Valid Data In 585 9t CLCL -165 nst LLWL ALE Low to RD or WR Low 200 300 3t CLCL -50 3t CLCL +50 nst AVWL Address to RD or WR Low 203 4t CLCL -75 nst QVWX Data Valid to WR Transition 23 t CLCL -30 nst QVWH Data Valid to WR High 433 7t CLCL -130 nst WHQX Data Hold After WR 33 t CLCL -25 nst RLAZ RD Low to Address Float 0 0 nst WHLH RD or WR High to ALE High 43 123 t CLCL -25 t CLCL +25 ns24AT89S52
AT89S52External Program Memory Read Cyclet LHLLALEPSENt AVLLt PLPHtt LLIVLLPLt PLIVtt PXAVPLAZtt PXIZLLAXt PXIXPORT 0A0 - A7INSTR INA0 - A7t AVIVPORT 2A8 - A15A8 - A15External Data Memory Read CycleALEt LHLLt WHLHPSENt LLWLt LLDVt RLRHRDPORT 0t LLAXtt RLDVt RHDZAVLLt RLAZ tRHDXA0 - A7 FROM RI OR DPLDATA IN A0 - A7 FROM PCLt AVDVINSTR INPORT 2P2.0 - P2.7 OR A8 - A15 FROM DPHA8 - A15 FROM PCH25
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CHAPTER 3METHODOLOGY3.1 OverviewThe
Page 3 and 4:
3.2.2 Analog To Digital Conversion
Page 5 and 6:
Figure 3.5: Source Code for Convers
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3.2.4 Water Monitoring System Circu
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3.3 Programming.Programming is the
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ISP flash programmer in Figure 3.11
Page 13 and 14: The Visual Basic program will start
Page 15 and 16: Distance(cm)ReadingVoltage Trial1 (
Page 17 and 18: 4.2 Signal ConversionA sensor has s
Page 19 and 20: 4.3 User InterfaceBased on Table 4.
Page 21 and 22: Hardware DesignBasically, the const
Page 23 and 24: CHAPTER 5CONCLUSION5.1 SummaryWater
Page 25 and 26: This project can be expanded by usi
Page 27 and 28: APPENDICES41
Page 29 and 30: cjne a,volt,xsamejmp startxsame:mov
Page 31 and 32: xsame19:jnc more19mov dptr,#XVALIDc
Page 33 and 34: etrx:jnb ri,$clr rimov a,sbufretdel
Page 35 and 36: ElseShape8.FillColor = vbWhiteEnd I
Page 37 and 38: Private Sub Timer3_Timer()Label3.Ca
Page 39 and 40: APPENDIX EData Sheet AT89S5253
Page 41 and 42: Features• Compatible with MCS-51
Page 43 and 44: AT89S52Block DiagramP0.0 - P0.7P2.0
Page 45 and 46: AT89S52weakly pulled high. Setting
Page 47 and 48: AT89S52Table 3a. AUXR: Auxiliary Re
Page 49 and 50: AT89S52Watchdog Timer(One-time Enab
Page 51 and 52: AT89S52Figure 6. Timer 2 Auto Reloa
Page 53 and 54: AT89S52Baud Rate GeneratorTimer 2 i
Page 55 and 56: AT89S52Oscillator CharacteristicsXT
Page 57 and 58: AT89S52frequency should be less tha
Page 59 and 60: Figure 15. Flash Programming and Ve
Page 61 and 62: AT89S52Table 9. Serial Programming
Page 63: AT89S52Absolute Maximum Ratings*Ope
Page 67 and 68: AT89S52Serial Port Timing: Shift Re
Page 69 and 70: Packaging Information44A, 44-lead,
Page 71 and 72: August 1997SemiconductorADC0802, AD
Page 73 and 74: ADC0802, ADC0803, ADC0804Absolute M
Page 75 and 76: ADC0802, ADC0803, ADC0804Electrical
Page 77 and 78: ADC0802, ADC0803, ADC0804Typical Pe
Page 79 and 80: ADC0802, ADC0803, ADC0804The device
Page 81 and 82: ADC0802, ADC0803, ADC0804V IN ±5VR
Page 83 and 84: ADC0802, ADC0803, ADC0804Figures 19
Page 85 and 86: ADC0802, ADC0803, ADC0804IRQ (4)†
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CHAPTER 3 METHODOLOGY 3.1 Overview The Water Monitoring ...

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