HD6417750RF240V Datasheet, PDF (65/606 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2600 Series

Section 2 CPU
2.5.2 Memory Data Formats
Figure 2.10 shows the data formats in memory. The H8S/2600 CPU can access word data and
longword data in memory, however 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, an address error does not
occur, however the least significant bit of the address is regarded as 0, so access begins the
preceding address. This also applies to instruction fetches.
When ER7 is used as an address register to access the stack, the operand size should be word or
longword.
Data Type
Address
Data Format
1-bit data
Address L
7
0
76 543210
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 2.10 Memory Data Formats
Rev. 7.00 Sep. 11, 2009 Page 29 of 566
REJ09B0211-0700