Interrupted Control Unit

Interrupted Control Unit

i)               TRAP

ii)             RST 7.5

iii)            RST 6.5

iv)            INTR

v)              INTA

 

It’s an internal or external signal which may disturb alter the sequence of the processor.

 

Interrupted are classified as: -

i)               Hardware and Software

ii)             Maskable or Non-maskable

iii)            Vectored or Non-vectored

 Hardware Interrupted: -

·       There are five hardware interrupted in 8085.

 According to priority are as follows:

-        TRAP

-        RST 7.5

-        RST 6.5

-        RST 5.5

-        INTR

Software Interrupted: -

·       There are eight software interrupts.

·       They are used either an instruction or along with INTR.

Ex:       RST₀---------RST₇

            RST_n ; n-0 to 7

Maskable interrupted: -

·       Interrupted which can be ignore or avoided even they are trigger.

Non-Maskable Interrupted: -

·       Interrupted which cannot be ignore or avoided even they are trigger.

·       TRAP is only non-maskable interrupted in 8085.

·       TRAP is also known as RST 4.5.

Vectored Interrupted: -

·       Interrupt which has specific address location.

Ex: - TRAP, RST 7.5, RST 6.5, RST 5.5

Non-Vectored Interrupted: -

·       Interrupt which has specific address location.

·       Ex: - INTR.