CHAPTER 3 METHODOLOGY 3.1 Overview The Water Monitoring ...

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APPENDIX FData Sheet ADC080454
Features• Compatible with MCS-51 ® Products• 8K Bytes of In-System Programmable (ISP) Flash Memory– Endurance: 1000 Write/Erase Cycles• 4.0V to 5.5V Operating Range• Fully Static Operation: 0 Hz to 33 MHz• Three-level Program Memory Lock• 256 x 8-bit Internal RAM• 32 Programmable I/O Lines• Three 16-bit Timer/Counters• Eight Interrupt Sources• Full Duplex UART Serial Channel• Low-power Idle and Power-down Modes• Interrupt Recovery from Power-down Mode• Watchdog Timer• Dual Data Pointer• Power-off FlagDescriptionThe AT89S52 is a low-power, high-performance CMOS 8-bit microcontroller with 8Kbytes of in-system programmable Flash memory. The device is manufactured usingAtmel’s high-density nonvolatile memory technology and is compatible with the industry-standard80C51 instruction set and pinout. The on-chip Flash allows the programmemory to be reprogrammed in-system or by a conventional nonvolatile memory programmer.By combining a versatile 8-bit CPU with in-system programmable Flash ona monolithic chip, the Atmel AT89S52 is a powerful microcontroller which provides ahighly-flexible and cost-effective solution to many embedded control applications.The AT89S52 provides the following standard features: 8K bytes of Flash, 256 bytesof RAM, 32 I/O lines, Watchdog timer, two data pointers, three 16-bit timer/counters, asix-vector two-level interrupt architecture, a full duplex serial port, on-chip oscillator,and clock circuitry. In addition, the AT89S52 is designed with static logic for operationdown to zero frequency and supports two software selectable power saving modes.The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port, andinterrupt system to continue functioning. The Power-down mode saves the RAM contentsbut freezes the oscillator, disabling all other chip functions until the next interruptor hardware reset.8-bitMicrocontrollerwith 8K BytesIn-SystemProgrammableFlashAT89S52Rev. 1919A-07/011
Page 1 and 2: 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
Page 7 and 8: 3.2.4 Water Monitoring System Circu
Page 9 and 10: 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 (
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: APPENDIX EData Sheet AT89S5253
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 and 64: AT89S52Absolute Maximum Ratings*Ope
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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