What is Jnz instruction?
The JNZ instruction transfers control to the specified address if the value in the accumulator is not 0. If the accumulator has a value of 0, the next instruction is executed. Neither the accumulator nor any flags are modified by this instruction.
What does Jnz command do in 8085?
In 8085 Instruction set, we are having one mnemonic JNZ a16, which stands for “Jump if Not Zero” and “a16” stands for any 16-bit address. This instruction is used to jump to the address a16 as provided in the instruction. But as it is a conditional jump so it will happen if and only if the present zero flag value is 0.
What does JNC instruction do?
The JNC instruction transfers program control to the specified address if the carry flag is 0. Otherwise, execution continues with the next instruction. No flags are affected by this instruction.
What do you mean by JC and Jnz?
JC = Jump if carry set (C=1) JNC = Jump if carry is not set (C=0) JZ = Jump if zero-flag is set JNZ = Jump if zero-flag is not set JEQ = Jump if equal => another ‘name’ for JZ (There are many instruction aliases’).
How jump is different from Jnz?
This is performed by a set of jump instructions j depending upon the condition….Conditional Jump.
| Instruction | Description | Flags tested |
|---|---|---|
| JNE/JNZ | Jump not Equal or Jump Not Zero | ZF |
| JA/JNBE | Jump Above or Jump Not Below/Equal | CF, ZF |
How many T states are required for the execution for Jnz when condition is false?
If register B =00 H then the JNZ condition will be false as it is zero. Hence 7 t- states.
How JMP is different from Jnz?
JMP . is essentially an infinite loop as the code will keep jumping back to itself infinitely until you get an interrupt . The JNZ statement is a conditional jump statement which will work as JMP when the zero flag is not set ( Z = 0 ).
What is the difference between JMP and JNC instructions?
The program sequence is transferred to the memory address given in the operand based on the specified flag of the PSW….Difference between call and jump instructions in 8085 Microprocessor.
| Mnemonics, Operand | Opcode (in HEX) | Bytes |
|---|---|---|
| JMP Label | C3 | 3 |
| JNC Label | D2 | 3 |
| JNZ Label | C2 | 3 |
| JP Label | F2 | 3 |
How many opcodes are there in 8085?
As we know that the 8085 microprocessor is an 8-bit microprocessor. So, a total of 256 instruction codes can be generated using 8-bit combinations.
What is the purpose of zero flag?
Along with a carry flag, a sign flag and an overflow flag, the zero flag is used to check the result of an arithmetic operation, including bitwise logical instructions. It is set to 1, or true, if an arithmetic result is zero, and reset otherwise.
What is DEC in assembly?
The DEC instruction is used for decrementing an operand by one. It works on a single operand that can be either in a register or in memory.
What is the function of hold pin?
HOLD – It indicates that another device is requesting the use of the address and data bus. Having received HOLD request the microprocessor relinquishes the use of the buses as soon as the current machine cycle is completed.
What is JNZ A16 instruction in 8085?
In 8085 Instruction set, we are having one mnemonic JNZ a16, which stands for “Jump if Not Zero” and “a16” stands for any 16-bit address. This instruction is used to jump to the address a16 as provided in the instruction.
What is the architecture of 8085?
The 8085 is based on Von-Neumann architecture, where the data and instructions are in the same memory space without any distinction between them. A lot of components, right?
Does the 8085 have an instruction register?
( The 8085 has an instruction register, which, you can call as an older design of a pipeline, performing a similar function. This is a significant oversimplification, but the analogy holds for the sake of understanding.)
How many T-states are required for JNZ instruction?
Summary − So this instruction JNZrequires 3-Bytes, 3-Machine Cycles (Opcode Fetch, Memory Read, MemoryRead) and 10 T-States for execution as shown in the timing diagram.