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PIN Specification of 8086 Microprocessor

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Nikhil Kumar
Nikhil Kumar

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NRI INSTITUTE OF RESEARCH SCIENCE AND TECHNOLOGY
INTEL 8086 - Pin Diagram RCET Microprocessor & Microcontroller 2
INTEL 8086 - Pin Details RCET Microprocessor & Microcontroller 3 Ground Clock Duty cycle: 33% Power Supply 5V ο‚± 10% Reset Registers, seg regs, flags CS: FFFFH, IP: 0000H If high for minimum 4 clks
INTEL 8086 - Pin Details RCET Microprocessor & Microcontroller 4 Address/Data Bus: Contains address bits A15-A0 when ALE is 1 & data bits D15 – D0 when ALE is 0. Address Latch Enable: When high, multiplexed address/data bus contains address information.
INTEL 8086 - Pin Details RCET Microprocessor & Microcontroller 5 INTERRUPT Non - maskable interrupt Interrupt request Interrupt acknowledge
INTEL 8086 - Pin Details RCET Microprocessor & Microcontroller 6 Direct Memory Access Hold acknowledge Hold
INTEL 8086 - Pin Details RCET Microprocessor & Microcontroller 7 Address/Status Bus Address bits A19 – A16 & Status bits S6 – S3
INTEL 8086 - Pin Details RCET Microprocessor & Microcontroller 8 Bus High Enable/S7 Enables most significant data bits D15 – D8 during read or write operation. S7: Always 1. BHE#, A0: 0,0: Whole word (16-bits) 0,1: High byte to/from odd address 1,0: Low byte to/from even address 1,1: No selection
INTEL 8086 - Pin Details RCET Microprocessor & Microcontroller 9 Min/Max mode Minimum Mode: +5V Maximum Mode: 0V Minimum Mode Pins Maximum Mode Pins
Microprocessor & Microcontroller Minimum Mode- Pin Details RCET 10 Read Signal Write Signal Memory or I/0 Data Bus Enable Data Transmit/Recei ve
Maximum Mode - Pin Details RCET Microprocessor & Microcontroller 11 Status Signal Inputs to 8288 to generate eliminated signals due to max mode. S2 S1 S0 000: INTA 001: read I/O port 010: write I/O port 011: halt 100: code access 101: read memory 110: write memory 111: none - passive
Maximum Mode - Pin Details RCET Microprocessor & Microcontroller 12 DMA Request/Grant Lock Output Lock Output Used to lock peripherals off the system Activated by using the LOCK: prefix on any instruction
Maximum Mode - Pin Details RCET Microprocessor & Microcontroller 13 Queue Status Used by numeric coprocessor (8087) QS1 QS0 00: Queue is idle 01: First byte of opcode 10: Queue is empty 11: Subsequent byte of opcode

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PIN Specification of 8086 Microprocessor

  • 1. NRI INSTITUTE OF RESEARCH SCIENCE AND TECHNOLOGY
  • 2. INTEL 8086 - Pin Diagram RCET Microprocessor & Microcontroller 2
  • 3. INTEL 8086 - Pin Details RCET Microprocessor & Microcontroller 3 Ground Clock Duty cycle: 33% Power Supply 5V ο‚± 10% Reset Registers, seg regs, flags CS: FFFFH, IP: 0000H If high for minimum 4 clks
  • 4. INTEL 8086 - Pin Details RCET Microprocessor & Microcontroller 4 Address/Data Bus: Contains address bits A15-A0 when ALE is 1 & data bits D15 – D0 when ALE is 0. Address Latch Enable: When high, multiplexed address/data bus contains address information.
  • 5. INTEL 8086 - Pin Details RCET Microprocessor & Microcontroller 5 INTERRUPT Non - maskable interrupt Interrupt request Interrupt acknowledge
  • 6. INTEL 8086 - Pin Details RCET Microprocessor & Microcontroller 6 Direct Memory Access Hold acknowledge Hold
  • 7. INTEL 8086 - Pin Details RCET Microprocessor & Microcontroller 7 Address/Status Bus Address bits A19 – A16 & Status bits S6 – S3
  • 8. INTEL 8086 - Pin Details RCET Microprocessor & Microcontroller 8 Bus High Enable/S7 Enables most significant data bits D15 – D8 during read or write operation. S7: Always 1. BHE#, A0: 0,0: Whole word (16-bits) 0,1: High byte to/from odd address 1,0: Low byte to/from even address 1,1: No selection
  • 9. INTEL 8086 - Pin Details RCET Microprocessor & Microcontroller 9 Min/Max mode Minimum Mode: +5V Maximum Mode: 0V Minimum Mode Pins Maximum Mode Pins
  • 10. Microprocessor & Microcontroller Minimum Mode- Pin Details RCET 10 Read Signal Write Signal Memory or I/0 Data Bus Enable Data Transmit/Recei ve
  • 11. Maximum Mode - Pin Details RCET Microprocessor & Microcontroller 11 Status Signal Inputs to 8288 to generate eliminated signals due to max mode. S2 S1 S0 000: INTA 001: read I/O port 010: write I/O port 011: halt 100: code access 101: read memory 110: write memory 111: none - passive
  • 12. Maximum Mode - Pin Details RCET Microprocessor & Microcontroller 12 DMA Request/Grant Lock Output Lock Output Used to lock peripherals off the system Activated by using the LOCK: prefix on any instruction
  • 13. Maximum Mode - Pin Details RCET Microprocessor & Microcontroller 13 Queue Status Used by numeric coprocessor (8087) QS1 QS0 00: Queue is idle 01: First byte of opcode 10: Queue is empty 11: Subsequent byte of opcode