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paper of electronics registers address mode in 8051 MUJ

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Paper of registers address mode in 8051 in electronics

Course=electronics
Subject=registers address mode in 8051

Question no-1
Internal RAM is available in 8051


Optional Answers

(a)                  128bytes

(b)                  256 bytes

(c)                  4kb

(d)                  8kb

Sollution

(a)                  128bytes

Question no-2
The number of general purpose ports available in 8051 during expanded mode are


Optional Answers

(a)                  1

(b)                  2

(c)                  3

(d)                  4

Sollution

(b)                  2

Question no-3
The RS0 & RS1 bits in 8051 are


Optional Answers

(a)                  Not available in PSW

(b)                  Are bits of 3&4 of PSW

(c)                  Are bits of 4&5 of PSW

(d)                  In register bank itself

Sollution

(b)                  Are bits of 3&4 of PSW

Question no-4
How many timers are available in 8051


Optional Answers

(a)                  Two 8-bit timers

(b)                  Two 16-bit timers

(c)                  One 8-bit & One 16-bit timer

(d)                  One 16-bit timer

Sollution

(b)                  Two 16-bit timers

Question no-5
Bit 00 of bit addressable RAM in 8051 corresponds to


Optional Answers

(a)                  Bit 0 of RAM address OOH

(b)                  Bit 0 of RAM address 10H

(c)                  Bit 0 of RAM address 20 h

(d)                  Bit 0 of RAM address 30H

Sollution

(c)                  Bit 0 of RAM address 20 h

Question no-6
Timer1 runs & Timer 0 in 8051 stops when


Optional Answers

(a)                  TCON .6 = 1 & TCON .4=0

(b)                  TCON .4 = 0 & TCON .5=1

(c)                  TCON .6 = 0 & TCON .4=1

(d)                  TCON .4 = 1 & TCON .5=0

Sollution

(a)                  TCON .6 = 1 & TCON .4=0

Question no-7
Serial Port of 8051 uses following mode for programmable baud rate and nine data bit transmission


Optional Answers

(a)                  Mode 0

(b)                  Mode 1

(c)                  Mode 2

(d)                  Mode 3

Sollution

(d)                  Mode 3

Question no-8
Which bit of IP is to be set for making serial port interrupt has highest priority


Optional Answers

(a)                  IP.1

(b)                  IP.3

(c)                  IP.4

(d)                  IP.5

Sollution

(c)                  IP.4

Question no-9
Which port is used for AD0-AD7 lines in expanded mode of operations


Optional Answers

(a)                  P1

(b)                  P2

(c)                  P3

(d)                  P0

Sollution

(d)                  P0

Question no-10
If IP register has only the default priorities then which of the following has the highest priority


Optional Answers

(a)                  INT 0

(b)                  INT 1

(c)                  Timer 0 overflow

(d)                  Serial port

Sollution

(a)                  INT 0

Question no-11
Timer prevents monitors processor and prevent its hanging


Optional Answers

(a)                  Timer0

(b)                  Timer1

(c)                  Timer2

(d)                  Watchdog

Sollution

(d)                  Watchdog

Question no-12
Pin of 8051 which separate address and data bus in expanded mode


Optional Answers

(a)                  PSEN

(b)                  ALE

(c)                  RST

(d)                  XTAL1

Sollution

(b)                  ALE

Question no-13
Pin of PORT3 used by timers are


Optional Answers

(a)                  P3.0

(b)                  P3.1 & P3.4

(c)                  P3.2 & P3.5

(d)                  P3.4 & P3.5

Sollution

(d)                  P3.4 & P3.5

Question no-14
Auto Reload mode of timer is


Optional Answers

(a)                  Mode 0

(b)                  Mode 1

(c)                  Mode 2

(d)                  Mode 3

Sollution

(c)                  Mode 2

Question no-15
16-bit registers of 8051 is


Optional Answers

(a)                  TMOD

(b)                  IP

(c)                  SCON

(d)                  DPTR

Sollution

(d)                  DPTR

Question no-16
8051 pin enable external memory


Optional Answers

(a)                  EA/VPP

(b)                  PSEN

(c)                  ALE

(d)                  RST

Sollution

(a)                  EA/VPP

Question no-17
Crystal for 8051 helps in communication with computer


Optional Answers

(a)                  11.0529MHz

(b)                  11.0592KHz

(c)                  12MHz

(d)                  11.0592Mhz

Sollution

(d)                  11.0592Mhz

Question no-18
Which Port of 8051 is not having capability to give output without any external hardware


Optional Answers

(a)                  P1

(b)                  P3

(c)                  P0

(d)                  P2

Sollution

(c)                  P0

Question no-19
we can use DS1307 upto


Optional Answers

(a)                  forever

(b)                  2100

(c)                  1 year

(d)                  2010

Sollution

(b)                  2100

Question no-20
Maximum frequency can be generated by DS1307


Optional Answers

(a)                  it will not generate any frequency

(b)                  11.059Mhz

(c)                  1Hz

(d)                  32.768kHz

Sollution

(d)                  32.768kHz

Jai guru dev

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