CHAPTER 3 METHODOLOGY 3.1 Overview The Water Monitoring ...

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Serial Programming CharacteristicsFigure 18. Serial Programming TimingMOSIt OVSH t t SHOX SLSHt SHSLSCKMISOt SLIVTable 10. Serial Programming Characteristics, T A = -40° C to 85° C, V CC = 4.0 - 5.5V (Unless otherwise noted)Symbol Parameter Min Typ Max Units1/t CLCL Oscillator Frequency 0 33 MHzt CLCL Oscillator Period 30 nst SHSL SCK Pulse Width High 2 t CLCL nst SLSH SCK Pulse Width Low 2 t CLCL nst OVSH MOSI Setup to SCK High t CLCL nst SHOX MOSI Hold after SCK High 2 t CLCL nst SLIV SCK Low to MISO Valid 10 16 32 nst ERASE Chip Erase Instruction Cycle Time 500 mst SWC Serial Byte Write Cycle Time 64 t CLCL + 400 µs22AT89S52
AT89S52Absolute Maximum Ratings*Operating Temperature.................................. -55°C to +125°CStorage Temperature ..................................... -65°C to +150°CVoltage on Any Pinwith Respect to Ground .....................................-1.0V to +7.0VMaximum Operating Voltage ............................................ 6.6V*NOTICE: Stresses beyond those listed under “AbsoluteMaximum Ratings” may cause permanent damageto the device. This is a stress rating only andfunctional operation of the device at these or anyother conditions beyond those indicated in theoperational sections of this specification is notimplied. Exposure to absolute maximum ratingconditions for extended periods may affectdevice reliability.DC Output Current...................................................... 15.0 mADC Characteristics<strong>The</strong> values shown in this table are valid for T A = -40°C to 85°C and V CC = 4.0V to 5.5V, unless otherwise noted.Symbol Parameter Condition Min Max UnitsV IL Input Low Voltage (Except EA) -0.5 0.2 V CC -0.1 VV IL1 Input Low Voltage (EA) -0.5 0.2 V CC -0.3 VV IH Input High Voltage (Except XTAL1, RST) 0.2 V CC +0.9 V CC +0.5 VV IH1 Input High Voltage (XTAL1, RST) 0.7 V CC V CC +0.5 VV OL Output Low Voltage (1) (Ports 1,2,3) I OL = 1.6 mA 0.45 VV OL1Output Low Voltage (1)(Port 0, ALE, PSEN)I OL = 3.2 mA 0.45 VV OHV OH1Output High Voltage(Ports 1,2,3, ALE, PSEN)Output High Voltage(Port 0 in External Bus Mode)I OH = -60 µA, V CC = 5V ± 10% 2.4 VI OH = -25 µA 0.75 V CC VI OH = -10 µA 0.9 V CC VI OH = -800 µA, V CC = 5V ± 10% 2.4 VI OH = -300 µA 0.75 V CC VI OH = -80 µA 0.9 V CC VI IL Logical 0 Input Current (Ports 1,2,3) V IN = 0.45V -50 µAI TLLogical 1 to 0 Transition Current(Ports 1,2,3)V IN = 2V, V CC = 5V ± 10% -650 µAI LI Input Leakage Current (Port 0, EA) 0.45 < V IN < V CC ±10 µARRST Reset Pulldown Resistor 10 30 KΩC IO Pin Capacitance Test Freq. = 1 MHz, T A = 25°C 10 pFI CCPower Supply CurrentActive Mode, 12 MHz 25 mAIdle Mode, 12 MHz 6.5 mAPower-down Mode (1) V CC = 5.5V 50 µANotes: 1. Under steady state (non-transient) conditions, I OL must be externally limited as follows:Maximum I OL per port pin: 10 mAMaximum I OL per 8-bit port:Port 0: 26 mA Ports 1, 2, 3: 15 mAMaximum total I OL for all output pins: 71 mAIf I OL exceeds the test condition, V OL may exceed the related specification. Pins are not guaranteed to sink current greaterthan the listed test conditions.2. Minimum V CC for Power-down is 2V.23
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CHAPTER 3METHODOLOGY3.1 OverviewThe
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3.2.2 Analog To Digital Conversion
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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
Page 11 and 12: 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 (
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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: AT89S52Table 9. Serial Programming
Page 65 and 66: AT89S52External Program Memory Read
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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