The 8051 Microcontroller Questions

• An alternate function of port pin P3.0 (RXD) in the 8051 is:
• The following command will copy the accumulator to the location whose address is 23H: MOV 23H,A
• When the 8051 is reset and the EA line is LOW, the program counter points to the first program instruction in the:
• Which of the following statements will add the accumulator and register 3?
• Which of the following instructions will move the contents of the accumulator to register 6?
• The statement LCALL READ passes control to the line labelled READ.
• Data transfer from I/O to external data memory can only be done with the MOVX command.
• This program code will be executed continuously: STAT: MOV A, #01H JNZ STAT
• A HIGH on which pin resets the 8051 microcontroller?
• The start-conversion on the ADC0804 is done by using the:
• The address space of the 8051 is divided into four distinct areas: internal data, external data, internal code, and external code.
• A label is used to name a single line of code.
• Which of the following instructions will move the contents of register 3 to the accumulator?
• The 8051 is a 40-pin IC. Twenty-two pins are needed for the four I/O ports.
• Different instruction sets must make up for the various members of the 8051 family.
• The RST pin requires a HIGH to reset the 8051 microcontroller.
• Up to 65K of code memory and 65K of data memory can be added to any of the 8051 family members.
• In an 8051 program DA A adjusts the value in the accumulator resulting from an addition into two BCDs.
• Writing counter/loop programs is much more difficult with the introduction of the DJNA and the CJNE instructions.
• Analog output current must be converted into a usable voltage. To perform this current-to-voltage conversion a 700 op amp may be used.