Unit I

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Other 8051 featurs only 1 On chip oscillator (external crystal) 6 interrupt sources (2 external , 3 internal, Reset) 64K external code (program) memory(only read)PSEN 64K external data memory(can be read and write) byRD,WR Code memory is selectable by EA (internal or external) We may have External memory as data and codeM.Balakarthikeyan -
Three criteria in Choosing aMicrocontroller meeting the computing needs of the task efficiently andcost effectively speed, the amount of ROM and RAM, the number of I/O ports andtimers, size, packaging, power consumption easy to upgrade cost per unit availability of software development tools assemblers, debuggers, C compilers, emulator, simulator,technical support wide availability and reliable sources of themicrocontrollersM.Balakarthikeyan -
Page 1 and 2: The 8051MicrocontrollerM.Balakarthi
Page 3: Block DiagramExternal InterruptsInt
Page 7: Comparison of the 8051 Family Membe
Page 10 and 11: 8051Foot Print123456789101112131415
Page 12 and 13: Port 3 Alternate FunctionsM.Balakar
Page 14 and 15: Hardware Structure of I/O PinRead l
Page 16 and 17: Writing “1” to Output Pin P1.XR
Page 18 and 19: Reading “High” at Input PinRead
Page 20 and 21: Port 0 with PullUp ResistorsVcc10
Page 22 and 23: Pins of 8051 Vcc ( pin 40 ):Vcc pro
Page 24 and 25: XTAL Connection to an External Cloc
Page 26 and 27: Pins of 8051 RST ( pin 9 ): reset i
Page 28 and 29: RESET Value of Some 8051 Registers:
Page 30 and 31: Pins of 8051 ALE ( pin 30 ): addres
Page 32 and 33: Address Multiplexingfor External Me
Page 34 and 35: Accessing ExternalData MemoryFigure
Page 36 and 37: External code memoryWRRDPSENALEP0.0
Page 38 and 39: Overlapping External Codeand Data S
Page 40 and 41: Overlapping External Codeand Data S
Page 42 and 43: On-Chip MemoryInternal RAMM.Balakar
Page 44 and 45: Bit Addressable Memory2F2E2D2C2B2A2
Page 46 and 47: Bit Addressable RAMFigure 2-6Summar
Page 48 and 49: M.Balakarthikeyan -
Page 50 and 51: M.Balakarthikeyan -
Page 52 and 53: RegistersM.Balakarthikeyan -
Page 54 and 55:
The 8051Assembly LanguageM.Balakart
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Data Transfer Instructions MOV dest
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Addressing ModesImmediate Mode - co
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Addressing ModesDirect Mode - speci
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Addressing ModesRegister Indirect -
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Addressing ModesRegister Indexed Mo
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Acc Register A register can be acce
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SFRs AddressAll SFRs such as(ACC, B
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8051 Instruction Format Register ad
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8051 Instruction Format relative ad
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Stackspushpopstack pointerstackGo d
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Stack (push,pop) ThereforePush aPus
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Bit-Oriented Data Transfer transfer
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Data Processing InstructionsArithme
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Arithmetic InstructionsMnemonicADD
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Instructions that Affect PSW bitsM.
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Signed Addition and Overflow2’s c
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The 16bit ADD example; Computes Z
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Increment and DecrementINC AINC byt
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MultiplyWhen multiplying two 8bit
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Decimal AdjustDA a; decimal adjust
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Bitwise LogicANL ANDORL ORXRL XO
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Uses of Logic Instructions Force in
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CLR ( Set all bits to 0)CLR ACLR by
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Rotate through CarryRRC aCmov a, #0
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SwapSWAP amov a, #72h ; a 27hswap
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Program Flow Control Unconditional
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Infinite LoopsStart: mov C, p3.7mov
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Jump tableMov dptr,#jump_tableMov a
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Conditional jumpsMnemonicDescriptio
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More Conditional JumpsMnemonicCJNE
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Iterative Loops(examples)mov a,#50h
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Return Return is also similar to a
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Initializing Stack Pointer SP is in
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Subroutine - another example; Progr
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example of delaymov a,#0aahBack1:mo
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Example; Move string from code memo
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Example; duty cycle 50%back: cpl p1
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M.Balakarthikeyan -8051 timer
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Interrupt Sources Original 8051 has
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Interrupt Priorities What if two in
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Interrupt VectorsEach interrupt has
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Example Interrupt Service Routine;E
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Unit I

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