Memory Data Formats; Figure 2.10 Memory Data Formats - Renesas H8S Series Hardware Manual

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
1-bit data Address L
Byte data Address L
Word data Address 2M
Address 2M+1
Longword data Address 2N
Address 2N+1
Address 2N+2
Address 2N+3

Figure 2.10 Memory Data Formats

Data Format
7
7 6 5 4 3 2 1
LSB
MSB
MSB
LSB
MSB
LSB
Rev. 6.00 Mar 15, 2006 page 29 of 570
Section 2 CPU
0
0
REJ09B0211-0600