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hsabaghianb @ kashanu.ac.ir                                                               Microprocessors  1-39

8086 Pin Description

Vcc (pin 40) : Power

Gnd (pin 1 and 20) : Ground

AD0..AD7 , A8..A15 , A19/S6, A18/S5, A17/S4, A16/S3 : 20 -bit Address Bus

MN/MX’ (input) : Indicates Operating mode

READY (input , Active High) : take uP to wait state

CLK (input) : Provides basic timing for the processor

RESET (input, Active High) : At least 4 clock cycles Causes the uP immediately

           terminate its present activity.

TEST’ (input , Active Low) : Connect this to HIGH

HOLD (input , Active High) : Connect this to LOW

HLDA (output , Active High) : Hold Ack

INTR (input , Active High) : Interrupt request

INTA’ (output , Active Low) : Interrupt Acknowledge

NMI (input , Active High) : Non-maskable interrupt

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