Index Register Indirect With Displacement-@(D:16,Rnl.b), @(D:32,Rnl.b), @(D:16,Rn.w), @(D:32,Rn.w), @(D:16,Ern.l), Or @(D:32,Ern.l); Register Indirect With Post-Increment, Pre-Decrement, Pre-Increment, Or Post-Decrement-@Ern+, @−Ern, @+Ern, Or @Ern - Renesas H8SX/1500 Series Hardware Manual

Section 2 CPU
2.8.4 Index Register Indirect with Displacement—@(d:16,RnL.B), @(d:32,RnL.B),
@(d:16,Rn.W), @(d:32,Rn.W), @(d:16,ERn.L), or @(d:32,ERn.L)
The operand value is the contents of a memory location which is pointed to by the sum of the
following operation result and a 16- or 32-bit displacement: a specified bits of the contents of an
address register (RnL, Rn, ERn) specified by the register field in the instruction code are zero-
extended to 32-bit data and multiplied by 1, 2, or 4. The displacement is included in the instruction
code and the 16-bit displacement is sign-extended when added to ERn. If the operand is byte data,
ERn is multiplied by 1. If the operand is word or longword data, ERn is multiplied by 2 or 4,
respectively.
2.8.5 Register Indirect with Post-Increment, Pre-Decrement, Pre-Increment,
or Post-Decrement—@ERn+, @−ERn, @+ERn, or @ERn−
(1)
Register indirect with post-increment—@ERn+
The operand value is the contents of a memory location which is pointed to by the contents of an
address register (ERn). ERn is specified by the register field of the instruction code. After the
memory location is accessed, 1, 2, or 4 is added to the address register contents and the sum is
stored in the address register. The value added is 1 for byte access, 2 for word access, or 4 for
longword access.
(2)
Register indirect with pre-decrement—@−ERn
The operand value is the contents of a memory location which is pointed to by the following
operation result: the value 1, 2, or 4 is subtracted from the contents of an address register (ERn).
ERn is specified by the register field of the instruction code. After that, the operand value is stored
in the address register. The value subtracted is 1 for byte access, 2 for word access, or 4 for
longword access.
(3)
Register indirect with pre-increment—@+ERn
The operand value is the contents of a memory location which is pointed to by the following
operation result: the value 1, 2, or 4 is added to the contents of an address register (ERn). ERn is
specified by the register field of the instruction code. After that, the operand value is stored in the
address register. The value added is 1 for byte access, 2 for word access, or 4 for longword access.
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