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In the 8085, trap, intr, and rstx.5 lines are checked on the falling edge of clock, at the beginning of the last T cycle of an instruction, or approximately one clock cycle before ALE.
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What is The highest priority interrupt in 8085 microprocessor?
In most of the Intel processors, the highest priority interrupt is the NMI line (called TRAP in the 8085). NMI means a non-maskable interrupt, and that means it cannot be delayed or ignored. The NMI line is usually used when there are problems such as non-recoverable errors, but it could be used for debugging or profiling.Most of the Intel CPUs have 2 interrupt lines, the NMI line and the standard interrupt line. The regular interrupt line is connected to one or more interrupt controllers which split that interrupt signal to different devices. The NMI line is for the most critical processes in the computer.
How do you disable Interrupt request lines?
The interrupt request lines on the 8085 (INTR, RST7.5, RST6.5, and RST5.5) can be disabled using the DI (Disable Interrupt) instruction. You re-enable with the EI instruction. Also, RST7.5, RST6.5, and RST5.5 can be individually enabled and disabled using the SIM (Set Interrupt Mask) and RIM (Read Interrupt Mask) instructions. The TRAP interrupt request line cannot be disabled.
How many pins are present in 8085 and 8086 microprocessor?
There are 256 ports available in the 8085 microprocessor. The IN and OUT instructions have an 8-bit port number, and that is where the 256 comes from.In order to use ports, the hardware addressing system must decode IO/M-. Some implementations don't do this, so they map IO addresses to memory addresses. In that case, you could say there are 65536 possible IO addresses, but that is not the same as ports, because ports are specific to the IN and OUT instructions.The other "problem" with IN and OUT is that you cannot specify the address in a register, while you can do so with indirect memory addressing.
What does IRQ stand for?
Abbreviation of interrupt request line, and pronounced I-R-Q. IRQs are hardware lines over which devices can send interrupt signals to the microprocessor. When you add a new device to a PC, you sometimes need to set its IRQ number by setting a DIP switch. This specifies which interrupt line the device may use. IRQ conflicts used to be a common problem when adding expansion boards, but the Plug-and-Play specification has removed this headache in most cases.see: http://www.webopedia.com/TERM/I/IRQ.html
How is demultiplexing done in 8085 microprocessor?
it is nothing
What is an Interrupt Give two examples of an Interrupt?
Interrupt is nothing but according to the priority of ur instruction the processor will assign memory to it and will keep the bus line busy .
What is a communications line between a device and the processor?
I believe it is interrupt request line.
Why it is called 8080 processor?
The 8085 microprocessor was an enhanced version of the 8080, primarily running on a single +5V power supply, hence the designation 8085.The 8086 microprocessor was an enhanced version of the 8085, primarily running as a 16 bit processor, hence the designation 8086.The 8088 microprocessor (part of the 8086/8088 family) was a version of the 8086 that run on an 8 bit bus, hence the designation 8088.
Which line will be activated when an output device require attention from CPU?
The interrupt line, of course.
How many interrupts in 8085 microprocessor?
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.
How much memory can be addressed by microprocessor with 14 address line?
16KB
Why are interrupt required?
Interrupts are required in order to get the attention of the CPU. A CPU typically has two interrupt lines. One is the nonmaskable interrupt line (NMI). That is used in the case of critical errors, since this interrupt cannot be ignored. The other one is the regular interrupt line. That is used by hardware devices and certain software to get the attention of the CPU. When you move a mouse, for instance, that creates both a hardware and software interrupt. So the CPU would then process the mouse driver code and move the cursor, then get back to what it was doing.
