HD6433694 Datasheet, PDF (64/432 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series

2.5.2 Effective Address Calculation
Table 2.12 indicates how effective addresses are calculated in each addressing mode. In this LSI
the upper 8 bits of the effective address are ignored in order to generate a 16-bit effective address.
Table 2.12 Effective Address Calculation (1)
No Addressing Mode and Instruction Format
1 Register direct(Rn)
op rm rn
2 Register indirect(@ERn)
op
r
3 Register indirect with displacement
@(d:16,ERn) or @(d:24,ERn)
op
r
disp
Effective Address Calculation
31
0
General register contents
31
0
General register contents
31
Sign extension
0
disp
Effective Address (EA)
Operand is general register contents.
23
0
23
0
4 Register indirect with post-increment or
pre-decrement
31
0
23
0
•Register indirect with post-increment @ERn+
General register contents
op
r
1, 2, or 4
•Register indirect with pre-decrement @-ERn
31
0
General register contents
23
0
op
r
1, 2, or 4
The value to be added or subtracted is 1 when the
operand is byte size, 2 for word size, and 4 for
longword size.
Rev. 4.00, 03/04, page 36 of 400