Let us consider DAD B is a sample instruction of this category. As It is 1-Byte
instruction
so it occupies a single Byte place in the memory. We are considering the initial content of HL and BC register pairs are 4050H and 4060H. So after 16-bit addition the current content of HL register pair will be 80B0H.
What is the function of instruction add B?
1. ADD: –
The content of operand are added to the content of the accumulator and the result is stored in Accumulator
. Eg- ADD B (it adds the content of accumulator to the content of the register B)
What is the use of Dad instruction?
In 8085 Instruction set, DAD SP instruction is a special case of DAD rp instruction. In this instruction contents of
HL and SP will get added and sum thus produced will get stored onto
HL register pair. It occupies only 1-Byte in memory. Let us discuss about this instruction execution with one example.
What happens when Dad instructions is executed?
It is a 1-Byte instruction. … With this instruction, with the content of the HL register pair, the contents of the mentioned register
pair will get added and the result thus produced will be stored
on the HL register pair.
What is the instruction XTHL mean?
In 8085 Instruction set, XTHL is a mnemonic that stands for “
eXchange Top of stack with HL
”. This instruction exchanges the contents of the top two locations of the stack with the contents of register pair HL.
Is 3 Byte A instruction?
Three-byte instructions –
Three-byte instruction is the
type of instruction in which the first 8 bits indicates the opcode and the next two bytes specify the 16-bit address
. The low-order address is represented in second byte and the high-order address is represented in the third byte.
What is the purpose of DAA?
The DAA (Decimal Adjust after Addition) instruction
allows addition of numbers represented in 8-bit packed BCD code
. It is used immediately after normal addition instruction operating on BCD codes. This instruction assumes the AL register as the source and the destination, and hence it requires no operand.
What does add B mean?
Accidental Death and Disability Benefit
. Medical » Disability. Rate it: ADDB.
How is push B instruction executed?
It is a
1-Byte instruction
. The result of execution of this instruction is shown below with an example. Summary − So this instruction PUSH B requires 1-Byte, 3-Machine Cycles (Opcode Fetch, Memory Write, Memory Write) and 12 T-States for execution as shown in the timing diagram.
How does SBB instruction work?
SBB is a mnemonic that stands for ‘SuBtract with Borrow’ and ‘R’ stands for any of the following 7 registers, and also memory location M as pointed by HL register pair. This instruction is used
to compute subtraction between contents of R register
from the Accumulator’s content, along with the carry (borrow) value.
What is the difference between ADD and dad?
ADD is the MIPS32 instruction, DADD is for MIPS64 where registers are 64-bits wide
rather than 32
. Both instructions do exactly the same thing, they are used in different MIPS architectures, that’s just it.
Which flag is updated by Stax instruction?
| Before After | (4050h) CDH ABH |
|---|
Which stack is used in 8085?
Answer:
LIFO (Last In First Out) stack
is used in 8085.In this type of Stack the last stored information can be retrieved first.
What type of instruction is pop?
| Mnemonics, Operand Opcode(in HEX) Bytes | POP PSW F1 1 |
|---|
Which register pair is used to indicate memory?
H and L register pair
is used to act as memory pointer and it holds 16 bit address of memory location.
What is the difference between ADD and ADC?
The ADD instruction adds the value of
Operand2
or imm12 to the value in Rn . The ADC instruction adds the values in Rn and Operand2 , together with the carry flag.
