Table of Contents
Which of the following instruction has 6 T States?
The OPCODE-FETCH cycle of CALL has 6 T-states to take care of the decrements of the Stack Pointer. RET instruction requires, 3 machine cycles, OPCODE-FETCH, MEMORY READ, MEMORY READ , even here, the microprocessor’s got to increment the stack pointer twice, as before, to pop.
How many T-State are in the memory read cycle?
This instruction uses immediate addressing for specifying the data. It occupies 2-Bytes in memory. Summary: So this instruction MVI M, ABH requires 2-Bytes, 3-Machine Cycles (Opcode Fetch, Memory Read, Memory Write) and 10 T-States for execution as shown in the timing diagram.
What is T-State explain?
The time required by the microprocessor to complete an operation of accessing memory or input/output devices is called machine cycle. One time period of frequency of microprocessor is called t-state. A t-state is measured from the falling edge of one clock pulse to the falling edge of the next clock pulse.
What operation is performed during 4 th T State of opcode fetch?
We do the decoding in T4 states. The control unit (CU) gets the opcode which corresponds to the 1-byte instruction whose mnemonic code is MOV C, M. The OF machine cycle is constituted by these 4 T states which we have described previously….Opcode Fetch (OF) machine cycle in 8085 Microprocessor.
| Mnemonics, Operand | Opcode (in HEX) | Bytes |
|---|---|---|
| STC | 37 | 1 |
What do you mean by T State?
One time period of frequency of microprocessor is called t-state. A t-state is measured from the falling edge of one clock pulse to the falling edge of the next clock pulse. Fetch cycle takes four t-states and execution cycle takes three t-states.
How many T states are in the memory read cycle Mcq?
Machine cycle is the part of the instruction cycle. Fetch cycle takes 4 t-states and Execution cycle takes 3 t-states.
Which requires maximum number of T states?
CALL instruction
Among the given instructions, CALL instruction will require maximum T-states for execution.
How many T states are needed for execution of shld?
16 T-States
Summary − So this instruction SHLD 4050H requires 3-Bytes, 5-Machine Cycles (Opcode Fetch, Memory Read, Memory Read, Memory Write, Memory Write) and 16 T-States for execution as shown in the timing diagram.