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An interrupt in the 8085, like in most computers, is a request to execute code out of sequence, usually by an external event, such as a signal from an IO device. In the 8085, an interrupt is almost exactly like a CALL instruction, except that the accumulator and flags register is also pushed on the stack. (Recall that the CALL instruction only pushes the return address on the stack.)This means that to return from an interrupt you must also pop the accumulator and flags, and this is done simply with the IRET instruction, as opposed to the RET instruction. In the 8085, the interrupt addresses are located in low memory, though the actual interrupt address could be anywhere if the interrupting device is capable of generating the three byte CALL sequence instead of the simpler INTx sequence, or the even simpler INTx.5 sequence.
Wiki User
∙ 14y ago
Wiki User
∙ 12y agoThe 8085 does not have 12 interrupts, it has five.
INTR
RST5.5
RST6.5
RST7.5
TRAP
If you are thinking about the interrupt vector table in low memory, which happens to have 12 entries, you are misclassifying things, as this table only applies to RST5.5, RST6.5, RST7.5, TRAP, and INTR vectors that use the RST instuction. In point of fact, the INTR vector can be anywhere in memory, because the hardware response vector can easily provide a CALL instruction instead of an RST instruction.
That said, the RST vector table in low memory is...
00H - RST 0
08H - RST 1
10H - RST 2
18H - RST 3
20H - RST 4
24H - TRAP
28H - RST 5
2CH - RST 5.5
30H - RST 6
34H - RST 6.5
38H - RST 7
3CH - RST 7.5
... where RST 0 through RST 7 are software interrupts or hardware vectors for INTR, and RST x.5 and TRAP are hardware interrupts.
Wiki User
∙ 11y agoFor X86 systems there are many different IRQs (Interrupt requests) But i can list the main ones.
IRQ 0- System timer
IRQ 1-Keyboard controller
IRQ 2- transfers signals from 8-15
IRQ3-Serial port controller for COM2
IRQ4-Serial port controller
IRQ5-Sound card
IRQ6- Floppy disk controller
IRQ7-Parallel port
IRQ8- RTC Timer
IRQ9-SCSI peripherals.
IRQ10-SCSI or NIC
IRQ11-SCSI or NIC
IRQ12-PS/2 Mouse.
IRQ13-Co-Processor
IRQ14-ATA
IRQ15-Secondary ATA
Wiki User
∙ 14y agoThere are 2 types interrupts in 8085 such as:
1)hardware interrupt
2)software interrupt
Wiki User
∙ 12y agoThere are 2 types of interrupts they are:
1) mask-able interrupts
2)non-mask able interrupts
Wiki User
∙ 12y agoTRAP, RST7.5, RST6.5, RST5.5, and INTR.
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What is an 8085 interrupt?
There are 2 types interrupts in 8085 such as: 1)hardware interrupt 2)software interrupt
What are the pins used to control interrupts?
The pins used to control interrupts in the 8085 are INTR/INTA, RST5.5, RST6.5, RST7.5, and TRAP.
How can mask or unmask the interrupts in 8085?
DI = Disable all interrupts (except TRAP) EI = Enable all interrupts Also, SIM can selectively mask RST5.5, RST6.5, and RST7.5.
Difference between 8080 and 8085?
The 8085 has a single +5V power supplyThe 8085 has a multiplexed low order address busThe 8085 has extra single pin interrupts, TRAP, RST7.5, RST6.5, and RST5.5The 8085 has serial I/O pins SID and SODThe 8085 has maskable interrupts and the RIM/SIM instructionThe 8085 includes the functionality of the 8224 clock genereator and 8228 system controllerThe 8085 added several 16 bit operations
What are the applications of hardware interrupts in 8085?
The hardware initiates an interrupt when it feels that the situation requires the CPU's action.
What is the lowest priority interrupt in the 8085 microprocessor?
The lowest priority interrupt in the 8085 microprocessor is INTR, unless you also consider the software interrupts, RST 0 through RST 7, which are even lower.
What is maskable in Intel 8085 microprocessore?
Four of the interrupts in the Intel 8085 (INTR, RST5.5, RST6.5, and RST7.5) are maskable, while one interrupt (TRAP) is non-maskable.The eight RSTx type of software "interrupts" are not really interrupts, but if they were treated as interrupts, they would be non-maskable.
What address does an 8085 start at and what address do the interrupts go to?
At reset, the 8085 starts at location 0000H. The INTR interrupt goes wherever the interrupt opcode says to go. The TRAP interrupt goes to 0024H. The RST5.5, RST6.5, and RST7.5 interrupts go to 002CH, 0034H, and 003CH respectively. The RST X interrupts goto 0000H plus 10H times X, i.e. 0000H, 0008H, 0010H, ..., 0038H.
What is advantage of trap pin ion 8085?
TRAP is a non maskable interrupt pin in 8085.....it has the highest priority out of all the interrupts...it is used in emergency n critical states..ex.during power loss etc.
Which register is used to set priority for interrupts?
The 8085 does not have an adjustable priority interrupt schema. You can only turn interrupts off, and mask certain interrupts, such as RST5.5, RST6.5, and RST7.5. However, that said, you can implement a priority schema, of sorts, within these interrupts, including INTR, by using the SIM instruction. You can't change the basic priority but you can disable certain interrupts while others are being serviced, if you so choose.
What do you mean by- 8085 microprocessor?
The 8085 was the next generation of the 8080, providing operation on a single +5V power supply, a multiplexed address/data bus, integration of the system controller and clock generator, new automatically vectored interrupts, a few 16 bit instructions, and serial I/O.
What is masking in 8085?
Masking in the 8085 is when certain interrupts are disabled, or masked, by instruction execution. TRAP is not maskable. INTR, RST7.5, RST6.5, and RST5.5 are maskable as a group with the EI and DI instructions. RST7.5, RST6.5, and RST5.5 are selectively maskable, even after the EI instruction, by using the RIM and SIM instructions.
