Digital Electronics Objectives Part 22
421 . Contents of stack pointer specify address of the top of stack.
422 . Contents of instruction register specify Op code for the instruction being executed.
423 . First byte of an instruction is loaded into IR register.
424 . Direction of the data bus is Bi-directional.
425 . Direction of the address bus is Uni-directional out of μp.
426 . The direction of the control bus is mixed direction i.e some lines into μp and some others ouf of μp.
Q 427 to Q 500 with respect to 8085 microporcessor.
427 . There are 16 lines in address bus.
428 . There are 8 lines in data bus.
429 . There are 6 interrupt control lines are there.
430 . Memory word size is 8 bits.
431 . Length of A-regiser is 8 bits.
432 . Length of IR (instruction register) is 8 bits.
433 . Length of PC (program counter) is 16 bits.
434 . Length of SP (stack pointer) is 16 bits.
435 . Length of status Word is 16 bits.
436 . Length of Temporary Register is 8 bits.
437 . Length of Data Buffer Register is 8 bits.
438 . There are 5flage.
439 . There are 5 interrupts.
440 . Memory word addressing capability is 64 K.