Interrupt

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Information about Interrupt
Education

Published on April 26, 2014

Author: shilpaitft

Source: slideshare.net

Description

Interrupts of intel 8085

What is an Interrupt? • It means interrupting the normal execution of the microprocessor.

Steps whenever there is an interrupt? current PC PC contents are stored in stack 100 101 102 103 104 103 103 STACK SP

4 Interrupts in 8085 Main routine Interrupt Save program counter Disable interrupts Send out interupt acknowledge Service routine Go to service routine Get original program counter Go back EI RET

HARDWARE INTERRUPT • It is a special signal from an I/O device to the computer.

SOFTWARE INTERRUPT • It is generated by a program interrupt instructions in the CPU.

TYPES OF INTERRUPTS • MASKABLE & NON- MASKABLE INTERRUPTS • VECTORED & NON-VECTORED INTERRUPTS • EDGE TRIGGERED & LEVEL TRIGGERED INTERRUPTS • PRIORITY BASED INTERRUPTS

MASKABLE INTERRUPTS EXAMPLE: • RST 7.5 • RST 6.5 • RST 5.5 • INTR • ONLY TRAP IS A NON MASKABLE INTERRUPT

VECTORED INTERRUPTS EXAMPLE: • RST 7.5 • RST 6.5 • RST 5.5 • TRAP

8085 Interrupts 8085 TRAP RST7.5 RST6.5 RST 5.5 INTR INTA

The addresses to which program control goes: NAME VECTOR ADDRESSES RST 7.5 003CH(7.5 X 0008H) RST 6.5 0034H(6.5 X 0008H) RST 5.5 002CH(5.5 X 0008H) TRAP 0024H(4.5 X 0008H) Absolute address is calculated by multiplying the RST value with 0008H.

NON – VECTORED INTERRUPT EXAMPLE: • INTR is a non vectored interrupt.

The 8085 Interrupts Interrupt name Maskable Vectored INTR Yes No RST 5.5 Yes Yes RST 6.5 Yes Yes RST 7.5 Yes Yes TRAP No Yes

EDGE TRIGGERED INTERRUPTS EXAMPLE: • RST 7.5

Edge triggering Rising edge Falling edge

LEVEL TRIGGERED INTERRUPT EXAMPLE: • RST 6.5 • RST 5.5 • INTR • TRAP is EDGE & LEVEL triggered interrupt.

Level triggering Low level High level

PRIORITY BASED INTERRUPTS INTERRUPT PRIORITY TRAP 1 RST 7.5 2 RST 6.5 3 RST 5.5 4 INTR 5

Five hardware interrupts are: • TRAP • RST 7.5 • RST 6.5 • RST 5.5 • INTR

TRAP (PIN-6) • Non- maskable • Has highest priority • Can not disable. • Edge & level triggered • Used for power failure & emergency shut off.

RST 7.5 • Maskable interrupt. • Has 2nd highest priority. • +ve edge triggered only.

RST 6.5 • Maskable interrupt. • 3rd highest priority. • Level triggered only.

RST 5.5 • Maskable interrupt. • 4th highest priority. • Level triggered only.

INTR • Maskable interrupt. • Lowest priority. • Level triggered.

INTA’ • Stands for Interrupt acknowledge. • Outgoing signal. • Active low signal.

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