It is a 2 byte-I/O read instruction. T4 State: In this state the Opcode which was fetched from the memory is decoded. A simple example is IN 22H. T2 state: Selected memory location is placed on the (D0-D7) of the A/D multiplexed bus. The first machine cycle is same as the memory read machine cycle, which is the Opcode fetch cycle.
In this article let us discuss about their different types and how they are being classified. This Opcode fetch machine cycle consists of 4 T-states. In the next article let us continue with the other 4 types of the machine cycle. slide 5 of 6 I/O read machine cycle This machine cycle is very similar to memory read machine cycle. ALE goes high so that the memory latches the (AD0-AD7) and then during the middle of the T1 state ALE goes low, so that complete 16-bit address are available. The data which was obtained from the memory is then decoded. At the middle of the T state the ALE goes low and the complete 16-bit address is made available for the Opcode fetch machine cycle. Usually machine cycle consists of 3 to 6 T-states.
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