What happens when INTR goes high in the 8085

Question

Briefly describe what occurs if the INTR signal goes high in the 8085 microprocessor?

Answer 1

The INTR is a mask-able break off for the 8085. It has the lowest precedence and is also non-vectored. When this INTR signal goes in the high state the subsequent things incurs or take place:

• For each and every instruction which is executed the 8085 checks the status of this interrupt.
• Till an instruction is finished the signal of INTR will remain high. Once an instruction is accomplished the processor sends an acknowledgement signal INTA.
• Immediately the INTA signal goes low a new opcode is situated on the data bus for transfer.
• Once the new instruction is received the processor saves the address of new instruction in the STACK and an interrupt service subroutine instigates.