Q. In timer mode, the oscillator clock is divided by a prescalar

View solution

Q. The serial port interrupt is generated if

View solution

Q. In serial port interrupt, after the control is transferred to the interrupt service routine, the flag that is cleared is

View solution

Q. The atleast number of machine cycles for which the external interrupts that are programmed level-sensitive should remain high is

View solution

Q. If the external interrupts are programmed edge sensitive, then they should remain high for atleast

View solution

Q. The timer generates an interrupt, if the count value reaches to

View solution

Q. The external interrupt that has the lowest priority among the following is

View solution

Q. Among the five interrupts generated by 8051, the lowest priority is given to the interrupt

View solution

Q. Among the five interrupts generated by 8051, the highest priority is given to the interrupt

View solution

Q. All the interrupts are enabled using a special function register called

View solution

Q. The number of bytes stored on the stack during one operation of PUSH or POP is

View solution

Q. The step involved in PUSH operation is

View solution

Q. The step involved in POP operation is

View solution

Q. The 8051 stack is

View solution

Q. After reset, the stack pointer(SP) is initialized to the address of

View solution

Q. The address register for storing the 8-bit addresses can be

View solution

Q. The instruction, ADD A, R7 is an example of

View solution

Q. The instruction, ADD A, #100 performs

View solution

Q. In which of these addressing modes, a constant is specified in the instruction, after the opcode byte?

View solution

Q. The only memory which can be accessed using indexed addressing mode is

View solution