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MOVH : MOVe Halfword High
Like MOV, this instruction copies either
to the destination register. However, this data is shifted left by 16 bits and the lower half-word is
filled with Zeroes (like SHL would do). This instruction is created to
make 32-bits data in YASEP32 with code sequences such as:
; put 12345678h in R1
MOVH 1234h R1 ; MSB
OR 5678h R1 ; LSB