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8086 maximum & minimum modes

8086 maximum & minimum modes. The mode is controlled by MN/MX. Maximum mode is obtained by connecting MN/MX to low and minimum mode is by connecting it to high. Having two different modes (minimum and maximum) is used only 8088/8086. Each mode enables a different control structure.

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8086 maximum & minimum modes

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  1. 8086 maximum & minimum modes • The mode is controlled by MN/MX. • Maximum mode is obtained by connecting MN/MX to low and minimum mode is by connecting it to high. • Having two different modes (minimum and maximum) is used only 8088/8086. • Each mode enables a different control structure. • Minimum mode operation and control signals are very similar to those of 8085. • So 8085 8-bit peripherals can be used with 8086 without special considerations. • Easy and least expensive way to build single processor systems

  2. Maximum mode • Maximum mode is designed to be used with a coprocessor exists in the system. • All the control signals (except RD) are not generated by the microprocessor. • But we still need those control signals. • Solution: • 8288.

  3. S2 S1 S0 operationsignal 0 0 0 Interrupt Acknowledge INTA 0 0 1 Read I/O port IORC 0 1 0 Write I/O port IOWC, AIOWC 0 1 1 Halt none 1 0 0 Instruction Fetch MRDC 1 0 1 Read Memory MRDC 1 1 0 Write Memory MWTC, AMWC 1 1 1 Passive none

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