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In 8085 μP, the READY signal is useful when the CPU communicates with

In 8085 μP, the READY signal is useful when the CPU communicates with Correct Answer a slow peripheral chip

READY signal:

  • Computer microprocessors generally run much faster than the computer's other subsystems
  • When the processor needs to access external memory, it starts placing the address of the requested information on the address bus
  • It then must wait for the answer, each of the cycles spent waiting is called a wait state
  • Thus, wait states helps to interface slow peripherals to the memory
  • The wait states are added by causing a READY signal to go low
  • This signal is used to delay the microprocessor Read or Write cycles until a slow-responding peripheral is ready to send or accept data.
  • When this signal goes low, the microprocessor waits for an integral number of clock cycles until it goes high.

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