Effective Address Calculation - Renesas Hitachi H8S/2194 Series Hardware Manual

If an odd address is specified in word or longword memory access, or as a branch address,
the least significant bit is regarded as 0, causing data to be accessed or an instruction code to
be fetched at the address preceding the specified address. (For further information, see
section 2.5.2, Memory Data Formats.)
2.7.2

Effective Address Calculation

Table 2.13 indicates how effective addresses are calculated in each addressing mode.
In normal mode the upper 8 bits of the effective address are ignored in order to generate a 16-bit
address.
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