Loading value directly in the Index register "XL"

[HTiwa.11]

I am using STM8S103F2 controller in assembly language. I want to load directly value in "XL" index register in one instruction and i do not want to affect "XH" register. (Index "x" register is the combination of XH and XL). Other ways to load value in "X" index register:

1. LDW x,#$50
2. LD A,#$10 LD XL,A

[Ozone]

> I want to load directly value in "XL" index register in one instruction ..

Is this the question ?

Check the STM8 family manuals for the instruction set. But I suppose there is none.

Almost all 8-bit architectures have highly non-orthogonal instruction set, to cram as much as possible instructions into 8 bit words.

This reduces instruction fetch and execution times.

The donwside is, most instructions support only a very limited number of source registers, and many just one implicit target register (the accu register).

[Tesla DeLorean]

There might be some undocumented instructions, more of a Z80/6502 guy than an STM8, I've been using 32-bit micros for many decades.

The LD XL,A method seems the least invasive.

There are perhaps PUSH/POP methods also

[Cristian Gyorgy]

The only method is the one you wrote at point no. 2, and also @Community member​  mentioned above:

LD A, #$10

LD XL, A

So, it will take 2 cycles.