1. INTERRUPTS OF INTEL 8085

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

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

10. 8085 Interrupts 8085 TRAP RST7.5 RST6.5 RST 5.5 INTR INTA

11. The addresses to which program control goes: Absolute address is calculated by multiplying the RST value with 0008H. 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)

13. 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

15. Edge triggering Rising edge Falling edge

17. Level triggering Low level High level

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

26. ANY QUERIES

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