How many external interrupts ae there in 8051 microcontroller ?

Calculate the checksum byte for the values 11H, 22H, and AAH.

Which of the following instructions is not a 2-byte instruction?

What will be the final value in the accumulator ? MOV A, #59H SWAP A INC A

What will be the final value in the accumulator ? MOV A, #55H MOV R0, #04H ANL A, R0

For how many machine cycles the RST pin should be kept high so that the 8051 microcontroller acknowledges it?

MOVDPTR, #FE00H;

Which addressing mode is shown in the above code?

Power saving modes IDLE and POWER DOWN are activated in 8051 by setting which bits respectively of the power control register (PCON)?

How much Data Memory is present in 8051 microcontroller?

Which of the following mode in 8051 timers, uses a variable baud rate ?