HD64F3670 RENESAS [Renesas Technology Corp], HD64F3670 Datasheet - Page 39

• Manufacturer Part Number: HD64F3670
• Description: Hitachi Single-Chip Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

2.3.2
Figure 2.6 shows the data formats in memory. The H8/300H 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 (SP) is used as an address register to access the stack, the operand size should be word
or longword.
Memory Data Formats
Data Type
1-bit data
Byte data
Word data
Longword data
Figure 2.6 Memory Data Formats
Address
Address L
Address L
Address 2M
Address 2M+1
Address 2N
Address 2N+1
Address 2N+2
Address 2N+3
MSB
MSB
MSB
7
7
6
Data Format
5
4
3
2
Rev. 2.0, 03/02, page 15 of 298
1
LSB
LSB
LSB
0
0