On power up, which RAM locations does the 8051 use for registers R0-R7?

Which register is responsible for the power down mode of the microcontroller 8051 ?

Which of the following instructions is invalid?

The ROM-less version of the 8051 microcontroller is called the:

In 8051 microprocessor , in TCON register, which bits are responsible for the external interrupt signal type ?

where is the PSW / PC status stored in 8051, once the interrupt request is received from any peripheral device?

What are the values in R1 and R0 registers in the last ?

MOV R1, #35H MOV R0, #25H PUSH 1 PUSH 0 POP 1 POP 0

Which register is important register in the instruction of any arithmetic operation from multiply , divide , add and substract.

Which of the following register is not accessible by the user ?

Which of the following instructions use direct addressing mode ?