01․ The 8085 microprocessor uses a crystal of frequency 6.25 Mhz. The T-state value is
We know Now,
02․ When an 8085 microprocessor is reset, the address bus contains
When an 8085 microprocessor is reset, the address bus contains 0000H.
03․ In an 8085 microprocessor based system, the contents of SP are 1000H, PUSH B instruction will transfer the contents of registers B & C respectively for memory locations
Stack pointer indicates the top of the stack memory. If data are to be moved in stack memory then those will start to be stored from above the address contained by stack pointer. In this problem stack pointer contains 1000 H. So when PUSH B instruction is given data will start to be stored from 0FFF H, 0FFE H, 0FFD H onwards.
04․ In an 8085 microprocessor based system, the contents of SP are 2000H. POP H instruction will transfer the contents of memory location
The content of 2001 H will be stored into H and content of 2000 H will be stored in L.
05․ PUSH B instruction in 8085 microprocessor causes
PUSH B instruction allows to copy the contents of register pairs B & C to the stack
06․ SUB A instruction in 8085
SUB R instruction allows to subtract the content of register R from Accumulator (A). Likewise, SUB A instruction will allow to subtract the content of Accumulator form Accumulator. Hence, carry and sign flags will be reset.
07․ In 8085 microprocessor , let the accumulator contains the value 0AH and register C contains the value 05H. After CMP C instruction is executed, the
CMP C instruction allows to subtract the content of Register C from Accumulator. So, in the given problem 05 H will be subtracted from 0AH and results 05 H whose binary form is (0000 0101)2. As content of Accumulator is greater than register C then both the carry and zero flag are reset.
08․ Which of the data transfer is not possible in microprocessor
In 8085 microprocessor memory to memory data transfer is not possible.
09․ In 8085 microprocessor, in response to RST 7.5 interrupts the execution is transferred to memory location
The vector address of RST 7.5 is hexadecimal equivalent of . So, in response to RST 7.5 interrupts the execution is transferred to memory location 003CH.
10․ In 8085 microprocessor which one of the following statement is wrong
8085 microprocessor has two signals to implement serial data transmission SID(Serial Input Data) and SOD(Serial Output Data).Serial I/O is also possible through SIM (Serial output data) and RIM (Serial input data) instruction in 8085 microprocessor.