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Extended sequence command help needed

Hi everyone,

I'm fairly new to the C166 architecture and I am trying to debug some old C166 assembler code, but I am having a hard time understanding how the extended sequence command works exactly.

Here is the code:

mov r4, word_C3324
mov r5, word_C3326
mov word_C1A2, r4
mov word_C1A4, r5
mov r4, word_4484
mov r5, word_4486
exts r5, #1
movb rl3, [r4]
movbz r2, rl3
add r4, #1
addc r5, #0
exts r5, #1
movb rl3, [r4]
movbz r4, rl3
shl r4, #8
add r2, r4
mov word_C1E8, r2
mov r4, #2
or word_F33C, r4

Can someone help me understand what exactly is happening here?

Thank you.