How many interrupts in 8085 microprocessor?

Answer 1

The processor has 5 interrupts. They are presented below in the order of their priority (from lowest to highest):

INTR is maskable 8080A compatible interrupt. When the interrupt occurs the processor fetches from the bus one instruction, usually one of these instructions:

• One of the 8 RST instructions (RST0 - RST7). The processor saves current program counter into stack and branches to memory location N * 8 (where N is a 3-bit number from 0 to 7 supplied with the RST instruction).
• CALL instruction (3 byte instruction). The processor calls the subroutine, address of which is specified in the second and third bytes of the instruction.

RST5.5 is a maskable interrupt. When this interrupt is received the processor saves the contents of the PC register into stack and branches to 002Ch (hexadecimal) address.

RST6.5 is a maskable interrupt. When this interrupt is received the processor saves the contents of the PC register into stack and branches to 0034h (hexadecimal) address.

RST7.5 is a maskable interrupt. When this interrupt is received the processor saves the contents of the PC register into stack and branches to 003Ch (hexadecimal) address.

Trap is a non-maskable interrupt. When this interrupt is received the processor saves the contents of the PC register into stack and branches to 0024h (hexadecimal) address.

All maskable interrupts can be enabled or disabled using EI and DI instructions. RST 5.5, RST6.5 and RST7.5 interrupts can be enabled or disabled individually using SIM instruction.

Answer 2

when the software interrupt instruction executes:

(1) pushes the flags onto the stack

(2)clears the trap and interrupt flag bits

(3)pushes CS onto the stack

(4)fetches the new value for IP/EIP

(5)jumps to the new location addressed by CS and IP/EIP

----------------answered by Mahmud,APECE,DU

Answer 3

To be technical, it only has a single interrupt line and a single NMI line. For IBM compatibles, the single interrupt line was multiplexed using a single interrupt controller for XT compatibles (8 interrupts), and 2 cascaded interrupt controllers for AT compatibles (15 interrupts).

Answer 4

5. INTR, RST5.5, RST6.5, RST7.5, and TRAP.

Answer 5

it has 256 interrupts ..