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- Multiple ChoicePlease save your changes before editing any questions.
8051 microcontrollers are manufactured by which of the following companies?
Atmel
Philips
Intel
All of the mentioned
- Multiple ChoicePlease save your changes before editing any questions.
8051 series has how many 16 bit registers?
2
1
0
3
- Multiple ChoicePlease save your changes before editing any questions.
When the microcontroller executes some arithmetic operations, then the flag bits of which register are affected?
PSW
SP
DPTR
PC
- Multiple ChoicePlease save your changes before editing any questions.
How are the bits of the register PSW affected if we select Bank2 of 8051?
PSW.5=0 and PSW.4=1
PSW.2=0 and PSW.3=1
PSW.3=1 and PSW.4=1
PSW.3=0 and PSW.4=1
- Multiple ChoicePlease save your changes before editing any questions.
If we push data onto the stack then the stack pointer
increases with every push
decreases with every push
increases & decreases with every push
none of the mentioned
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On power up, the 8051 uses which RAM locations for register R0- R7
00-2F
00-07
00-7F
00-0F
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Which of the ports act as the 16 bit address lines for transferring data through it?
PORT 0 and PORT 1
PORT 1 and PORT 2
PORT 0 and PORT 2
PORT 1 and PORT 3
- Multiple ChoicePlease save your changes before editing any questions.
Which addressing mode is used in pushing or popping any element on or from the stack?
Immediate
direct
indirect
register
- Multiple ChoicePlease save your changes before editing any questions.
Which operator is the most important while assigning any instruction as register indirect instruction?
#
@
*
&
- Multiple ChoicePlease save your changes before editing any questions.
Which of the following comes under the indexed addressing mode?
MOVX A, @DPTR
MOVC @A+DPTR,A
MOV A,R0
MOV @R0,A
- Multiple ChoicePlease save your changes before editing any questions.
A valid division instruction always makes:
CY=0,AC=1
CY=1,AC=1
CY=0,AC=0
no relation with AC and CY
- Multiple ChoicePlease save your changes before editing any questions.
When an interrupt is enabled, then where does the pointer moves immediately after this interrupt has occurred?
to the next instruction which is to be executed
to the first instruction of ISR
to a fixed location in memory called interrupt vector table
to the end of the program
- Multiple ChoicePlease save your changes before editing any questions.
Which pin of the external hardware is said to exhibit INT0 interrupt?
pin no 10
pin no 11
pin no 12
pin no 13
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Which bit of the IE register is used to enable TxD/RxD interrupt?
IE.D5
IE.D2
IE.D3
IE.D4
- Multiple ChoicePlease save your changes before editing any questions.
Which of the following combination is the best to enable the external hardware interrupt 0 of the IE register (assuming initially all bits of the IE register are zero)?
EX0=1
EA=1
any of the mentioned
EX0=1 & EA=1