01․ Which of the following interrupt is only edge sensitive?
Among all interrupts RST 7.5 is only positive edge sensitive.RST 6.5 and RST 5.5 are level sensitive triggered.TRAP is both level and edge sensitive triggered.
02․ What is the vector address of INTR?
INTR is the one and only non-vectored interrupt in 8085 microprocessor so it has no addressing available in 8085 microprocessor. For INTR, external hardware is used to transfer program to specific CALL location.
03․ On receiving an interrupt from an I/O device, the CPU
After receiving an interrupt signal at first microprocessor will complete the current instruction and then it will branch off to the interrupt service routine.
04․ The ALE line of 8085 microprocessor is used to
The ALE (Address Latch Enable) line of 8085 microprocessor is used to latch the 8-bit of address lines AD0-AD7 into an external latch.
05․ The first operation performed in INTEL 8085 microprocessor after RESET is
After RESET instruction the processor execution will initialize from 0000H.
06․ After the execution of CMP A instruction
CMP R instruction compares the content of register R to accumulator and accordingly Zero and Carry flag will be affected. By CMP A instruction content of the accumulator is compared with the accumulator itself.The condition is that if A is same as comparing register zero flag will be set and carry flag will reset.
07․ The 8085 microprocessor will enter into INA cycle after recognition of
The 8085 microprocessor will enter into INA cycle after recognition of INTR only.
08․ Which of the following lists the interrupt in decreasing order of priority?
Priority wise decreasing order of interrupts is TRAP, RST 7.5, RST 6.5, RST 5.5, INTR. The first four interrupt are vectored interrupt. TRAP is highest priority interrupt but has a lower priority than HOLD signal.
09․ The interrupt vector address for TRAP is
For vectored interrupt the microprocessor assigns a specified memory location. The interrupt vector address for TRAP is 0024H.
10․ In order to reset the carry without affecting the accumulator content one has to use,
After OR operation CY (carry flag) & AC (auxiliary carry flag) is reset by default. So this is the most suitable instruction to reset carry.