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To load 16-bit data into a register pair in assembly language for microprocessors like the Intel 8086, the MOV instruction is commonly used. For example, you can use MOV AX, [address] to load a 16-bit value from a memory address into the AX register, or MOV DX, AX to transfer data from AX to DX if needed. Additionally, you can use PUSH and POP instructions for stack operations involving 16-bit data.
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What is register addressing mode?
If 8 or 16 bit data is required for executing the instruction present in register/register pair and named of register/register pair is given along the register.this instruction is called register addressing mode instruction.for example:MOV B,A
What is LDAX?
The LDAX/STAX instuctions in the 8085 load and store the accumulator. The target address used is contained in either the BC register pair (LDAX D), or the DE register pair (LDAX D).
What is HL pair in 8085 microprocessor?
HL is a register pair used to store 16 bit of data in 8085 microprocessor.
Why hl register pair special pair register?
The HL register pair in microcontrollers and microprocessors, such as the Intel 8085, serves as a special-purpose register for efficient data manipulation. It can hold a 16-bit address or a 16-bit data value, allowing for easy access to memory locations and facilitating operations like indirect addressing. This capability makes it particularly useful for pointer arithmetic and managing data in memory, enhancing the overall efficiency of program execution.
How does LHLD transfer insruction work in Intel 8085?
it stands for load HL pair with data from the specified location in the register. eg. LHLD 9200 Aditi Misra 3rd yr,B.tech,CSE Netaji Subhash Engineering College
What is h-L in the Intel 8085?
HL is a register pair that is used to store 16-bit data in 8085 Microprocessor
Why stax h not possible in 8085 microprocessor?
There is no STAX for HL register pair because the data transfer for STAX can be done through XCHG command. For ex: to transfer the data to the memory loaction specified by the HL pair we do as follows: XCHG STAX D for DE pair and BC pair we can directly do it using STAX
How many registers are there in an 8085 microprocessor?
Accumulator or A register is an 8-bit register used for arithmetic, logic, I/O and load/store operations. Flag is an 8-bit register containing 5 1-bit flags: * Sign - set if the most significant bit of the result is set. * Zero - set if the result is zero. * Auxiliary carry - set if there was a carry out from bit 3 to bit 4 of the result. * Parity - set if the parity (the number of set bits in the result) is even. * Carry - set if there was a carry during addition, or borrow during subtraction/comparison. General registers: * 8-bit B and 8-bit C registers can be used as one 16-bit BC register pair. When used as a pair the C register contains low-order byte. Some instructions may use BC register as a data pointer. * 8-bit D and 8-bit E registers can be used as one 16-bit DE register pair. When used as a pair the E register contains low-order byte. Some instructions may use DE register as a data pointer. * 8-bit H and 8-bit L registers can be used as one 16-bit HL register pair. When used as a pair the L register contains low-order byte. HL register usually contains a data pointer used to reference memory addresses. Stack pointer is a 16 bit register. This register is always incremented/decremented by 2. Program counter is a 16-bit register.
How many bits are contained in a register pair?
A register pair typically consists of two registers, each of which can contain a specific number of bits, commonly 8, 16, or 32 bits, depending on the architecture. Therefore, the total number of bits in a register pair is double the bit width of a single register. For example, if each register is 16 bits, the register pair would contain 32 bits.
What is the full form of LDAX?
The full form of LDAX is load accumulator from memory pointed by extended register denoted as "rp". It occupies only one byte in memory and the target address is contained in either the BC or DE register pair.
What is the difference between register addressing mode and register indirect addressing mode?
Ans: In the register addressing mode the operands are in registers which reside within the CPU. Register-mode instructions are 1-byte instructions and can be executed within the CPU without the need to reference memory for operands. But in the Register-indirect addressing mode the instruction specifies a register or a pair of registers in the processor whose contains give the address of the operand in memory. This mode uses 1-byte instructions even though the operand is in memory. Before using a register-indirect mode instruction, the programmer must ensure that the address of the operand is placed in the processor register with a previous transfer-type instruction. A reference to the register is then equivalent to specifying a memory address.
Why H-L pair register in 8085 is called special purpose register?
hl pair holds the address of the location pointed by the memory pointer M
