INSIDE 8051
CPU + RAM + ROM + I/O ALL ON 1 IC
WHAT IS MICROCONTROLLER?
WHICH OF THE FOLLOWING IS NOT A SHORT JUMP INSTRUCTION?
JZ, JNC LJMP, DJNZ
LJMP
MOV A,@RO
INDIRECT ADDRESSING MODE EX?
ADD A, SOURCE
ADD INST SYNTAX
MOV P0, #0FFH
MOV A, P0
READING DATA FROM P0?
[lable:] _________ [operands] [;comments]
mnemonic
FIND THE MACHINE CYCLE IF THE CRYSTAL FREQUENCY IS 18MHz?
1.5MHz
WHAT IS THE ERROR IN THE FOLLOWING INSTRUCTION
MOV A, @ R2
@R2
MUL AB
MULTIPLY INSTRUCTION SYNTAX
The contents of the accumulator after this operation
MOV A,#2BH
ORL A,00H
will be
2B H
PSW Register?
0 - P, 1 - -, 2 - OV, 3 - RS0, 4 - RS1, 5 - -, 6 - AC, 7 - C
LJMP & SJMP instructions take the same amount of time to execute even though one is a 3 byte and other is a 2 byte instruction. true or false
false
THE FOLLOWING ARE BIT ADDRESSES. INDICATE WHERE EACH ONE BELONG TO
A) 47H
B) 67H
A)28
B)2C
"CPL A" IS A ______(VALID OR INVALID) INSTRUCTION?
VLAID
PC = 0000 (answer)
Where the 8051 wakes up when it is powered up?
on returning from subroutine, where will the next instruction be taken from?
stack memory
GIVE ANOTHER INSTRUCTION FOR "CLR C"
mov acc.0, psw.7
clr acc.0
1 DIFFERENCE BETWEEN COMPILER AND ASSEMBLER?
USED IN HIGH LEVEL LANG, USED IN ALP
in calculating the target address for a jump, a displacement is added to the content of register ____
PC
ARE THE REGISTER TCON AND TMOD BIT ADDRESSABLE?
NO
the range of byte sized operands is - ___t o + _______
An alternate function of port pin P3.1 in the 8051 is:
serial port output