Which register is responsible for enabling and disabling interrupts?

The register that can be used as a scratch pad is

A 8051 microcontroller has inputs 1101 1011 to the TMOD registers, then which timer will act as counter ?

If the LSB of the TCON register is set then then which part of the microcontroller is not synchronized ?

Calculate the timer's clock frequency for the AT89C51 controller, with an XTAL frequency of 22 MHz.

For an interrupt to be guaranteed to be served, it should have a duration of how many machine cycles?

Which of the following code will check whether the D0 bit of register R2 is high or low?

Which addressing mode in 8051 is used with absolute jump (AJMP) and absolute call (ACALL) instructions?

Which port in 8051 microprocessor has no alternate functions and is only dedicated to input and output?

The above program is written in order to multiply the numbers B2H and 2FH. According to the program, in which registers are the LSB and MSB of the result stored?