3.8.15. LSRI: Logical Shift Right Immediate

Encoding (format 9, first word at lower address):

1 0 0 1 1 1 0 d₂ d₁ d₀ a₂ a₁ a₀ i₂ i₁ i₀

0 0 0 0 0 0 0 d₅ d₄ d₃ a₅ a₄ a₃ i₅ i₄ i₃

Syntax:

Constraints:

Outcome:

Notes:

If I ≥ 16 the result in R_d will be zero.
The shift is encoded with a value 1 less than specified (i.e. a shift of 1 is encoded as 000000₂. The rationale is that shifting by zero is pointless. It is not needed to clear the carry flag, since there are other ways of clearing the it (for example adding constant zero).