HD64F2357F20V Datasheet, PDF (62/1049 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-chip Microcomputer H8S Family / H8S/2300 Series

2.5.2 Memory Data Formats
Figure 2-8 shows the data formats in memory. The CPU can access word data and longword data in memory, but word or
longword data must begin at an even address. If an attempt is made to access word or longword data at an odd address, no
address error occurs but the least significant bit of the address is regarded as 0, so the access starts at the preceding
address. This also applies to instruction fetches.
Data Type
1-bit data
Address
Data Format
7
0
Address L 7 6 5 4 3 2 1 0
Byte data
Address L MSB
LSB
Word data
Address 2M MSB
Address 2M + 1
LSB
Longword data
Address 2N MSB
Address 2N + 1
Address 2N + 2
Address 2N + 3
LSB
Figure 2-8 Memory Data Formats
When ER7 is used as an address register to access the stack, the operand size should be word size or longword size.
Rev.6.00 Oct.28.2004 page 32 of 1016
REJ09B0138-0600H