8085 "CALL" instruction set- number of Tstates

Discussion in 'Homework Help' started by Swag, May 22, 2015.

  1. Swag

    Thread Starter New Member

    Apr 10, 2015
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    0
    CALL instruction has got 5machine cycles but how come it has got 18 T-states.
    (1)for opcode fetch--> [=4]
    (2)the 16bit address after CALL is read during M1 and M2 cycles and stored temporarily in W/Z register -->[read:3+3=6)
    (3)in next 2 cycles M3 & M4, contents of Program Counter are stored in stack -->[write: 3+3=6]
    Am getting total of 16Tstates; Can u please help how to get 18Tstates
     
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