0
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
What else can I help you with?
Hunting term for a pair of rabbits?
A pair of rabbits is commonly referred to as a "brace" in hunting terminology.
How many pair of appendages present in the body of prawn?
Prawns have five pairs of appendages on their body. These include two pairs of antennae, one pair of mandibles, one pair of maxillae, and three pairs of walking legs.
What is the use the first pair of wings?
The first pair of wings was used far before the time of the humans. Insects were the first to use wings.
Do insects have one pair of antennae?
Most insects have one pair of antennae, although some may have modified or reduced antennae. Antennae are important sensory organs that help insects detect their environment, find food, communicate, and navigate.
What is the cost of a hamster in India?
russian dwarf hamsters for ₹1200 syrian hamsters could cost 1400 a pair ₹2000 you would get a pair of hamsters with the cage
What is HL pair in 8085 microprocessor?
HL is a register pair used to store 16 bit of data in 8085 microprocessor.
What is h-L in the Intel 8085?
HL is a register pair that is used to store 16-bit data in 8085 Microprocessor
How do you do DCX D in Intel 8085 microprocessor?
DCX D means decrement register pair DE by one
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
Why does 8085 microprocessor has 8 bit flag register when it has only 5 flags?
The 8085 microprocessor has an 8-bit flag register, even though it only has 5 flags, because all of the registers in the 8085 are 8-bit or 16-bit. In fact, the flags register is considered to be part of the accumulator, as one "register pair", for purposes of stack push/pop and interrupt call/return. Be warned, however, that you should not attempt to change the state of bits stored on the stack and then pop'ing them into AF, because some of the three "unused" bits might be undocumented but actually used, or their meaning might change between different versions of the chip.
What is the significance of 'XCHG' and 'SPHL' instruction?
The 'XCHG' instruction in assembly language is used to exchange the values of two operands, typically a register and a memory location, effectively performing a swap without needing a temporary variable. It is significant for implementing atomic operations in multi-threaded programming. The 'SPHL' instruction, specific to certain assembly languages like 8085, is used to load the stack pointer (SP) with the address contained in the HL register pair, which is crucial for managing the stack in subroutine calls and local variable storage. Both instructions are fundamental for efficient low-level programming and system control.
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
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
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 mean by register pair of 8085?
In the 8085, six registers (B, C, D, E, F, H, and L) can be used as individual 8-bit registers, or paired up and treated as 16-bit registers. The pairs are BC, DE, and HL.
What is the purpose of INSTRUCTION REGISTER in 8085 Microprocessor?
In 8085 general purpose registers are used to hold data like any other registers. In 8085 there are six types of special registers called general purpose registers. The general purpose registers in 8085 are B, C, D, E, H and L. Each register can hold 8 bit data. Apart from above functions these registers can also be used to work in pairs to hold 16 bit data. They can work in pairs such as B-C, D-E, H-L to store 16 bit data. The H-L pair work as a memory pointer. A memory pointer holds the address of a particular memory location. They can store 16 bit address as they work in pairs.
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
