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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.
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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
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 is called as memory pointer?
Because in many statements you use HL as a pointer to memory data, eg: LD B,(HL) SUB A,(HL) LD (HL),E
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
What is the specific purpose of hl register?
HL is a general purpose 16 bit register. It is also the address in memory of the M register.
XTHL and SPHL pair in 8085 microprocessor?
XTHL exchanges HL register with the content of the stack. XTHL followed by RET allows to return to an other address than the one which was previously pushed by a CALL. Eg.: ... CALL FOOBAR ... FOOBAR ... LXI, H @@@@ XTHL RET ;return to @@@@, not after the 'call' Alain FOUERE 22april2009
Why zero flag is not set in INX instruction of microprocessor 8085?
Because that is the way Intel designed the INX instruction of the 8085. The 8080 is also the same. INX increments (and DCX decrements) the 16 bit register pairs or BC, DE or HL, depending on what register pair you specify in the INX (or DCX) instruction. To check is the value is 0 after an INX (or DCX) instruction, you need to OR the values of the register pair into the A register. For example..... INX H ;increment HL register pair MOV A,H ; move H register into the accumulator ORA L ; Logical OR it with the L register JZ ADDR ; If 0 then jump to ADDR
How would you use indirect address?
An indirect address is an address contained in a register or memory location, instead of in the instruction itself. In the 8085, the most common form is to load or calculate an address in the HL register, and then access the memory pointed to by HL using the M register designation, such as MOV A,M.
Which register in the 8085 processor is special purpose?
stack register is a special purpose register.
Assembly language program for bcd t0 decimal conversion in8085?
C600 LXI H C700 21 ; Initialize the HL register pair C601 00 ; C602 C7 ; C603 MOV A M 7E ; Move the content of memory to accumulator C604 MOV D A 57 ; Move accumulator content in to D register C605 RAR 1F ; Rotate accumulator right C606 XRA D AA ; Exclusive OR the content of D register C607 INX H 23 ; Increment the HL register pair C608 MOV M A 77 ; Move the accumulator content to memeory C609 HLT 76 ; Halt the execution
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.
