NOTE !! You must answer them all OR leave them to another Instructor.

Be aware These multiple choices from class "8051 Microcontroller and Embedded Systems"

Give direct answers!

1. A microprocessor always has which of the following components on the chip itself? A. UART CPU C. ROM D. Timers 2. Which of the following buses are always bi-directional? A. All control buses B. The address bus C.The data bus D. Data bus and address bus 3. The 8051 carry flag is set whenever A there is a carry from the D3 to the D4 bit B. there is a carry beyond the D7 bit C. the A register contains an odd number of 1s D)the A register contains an even number of 1s 4. Find the organization and chip capacity for ROM with 12 address pins and 4 data pins. A. 4K x 12, 48K bits B. 16K x 4, 48K bits C 8K x 4, 32K bits D. 4K x 4, 16K bits Which of the following registers can be used for register indirect addressing mode? RO and R1 B. RO and R7 C. R6 and R7 D. R5 and R3