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
    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