Embedded Systems Mid - I, September - 2014

1.In 8051 an external interrupt 1 vector address is of ________ and causes of interrupt if ________. 000BH, a high to low transition on pin INT1
  • 001BH, a low to high transition on pin INT1
  • 0013H, a high to low transition on pin INT1
  • 0023H, a low to high transition on pin INT1
Answer: C
2.Serial port vector address is of _______. And causes an interrupt when ________.
  • 0013H, either TI or RI flag is set
  • 0023H, either TI or RI flag is reset
  • 0013H, either TI or RI flag is reset
  • 0023H, either TI or RI flag is set
Answer: D
3.The internal RAM memory of 8051 is
  • 32 Bytes
  • 64 Bytes
  • 128 Bytes
  • 256 Bytes
Answer: C
4.The 8051 can handle____________ Interrupt Sources
  • 3
  • 4
  • 5
  • 6
Answer: C
5.The 8051 has _____________ I/O ports.
  • 3
  • 4
  • 5
  • 6
Answer: B
6.The three main components of digital computer system are
  • memory ,I/O,DMA
  • ALU,CPU,I/O
  • memory ,CPU,I/O
  • control circuits ,ALU, registers
Answer: C
7.A_________________ program is loaded from disk into RAM and tested the machine language file under user control.
  • bugging
  • debugging
  • compile
  • assemble
Answer: B
8.Mnemonic code to add the content of A, the direct address contents, and C flag.
  • ADDC A, #n
  • ADDC A, add
  • ADDC A, Rr
  • ADDC A, @Rp
Answer: B
9.What are control registers?
  • TCON and IE
  • IE and SBUF
  • PC and DPTR
  • IP and PC
Answer: A
10._____________memory for variable data that can be altered as the program runs.
  • ROM
  • RAM
  • RAAM
  • ROOM
Answer: B
11.PSOC stands for__________________________
Answer: Programmable system on chip
12.Name the major blocks of PSOC_________________________________
Answer: Analog and digital blocks
13.In 8051 architecture, __________________is the 16bit register which holds the address of the external data memory address to be accessed.
Answer: DPTR
14.A ________________ op code is encountered at the end of the subroutine.
Answer: RET
15.The total external memory that can be interfaced to 8051 is________________
Answer: 64KB
16.______________ I/O port does not have dual role.
Answer: Port 1
17.Over flow flag is used in _________________ type of arithmetic operations.
Answer: Signed
18.______________Instructions are used for stack operations in 8051.
Answer: PUSH & POP
19.______________ Flag is used to start Timer 0.
Answer: T0
20._____________ register is used as a buffer for serial communication in 8051.
Answer: SBUF