r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 87
r4f2456
Manufacturer Part Number
r4f2456
Description
16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.R4F2456.pdf
(1376 pages)
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2.5.2
Figure 2.10 shows the data formats in memory. The H8S/2600 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.
When SP (ER7) is used as an address register to access the stack, the operand size should be word
size or longword size.
Memory Data Formats
Data Type
1-bit data
Byte data
Word data
Longword data
Figure 2.10 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
Rev. 1.00 Sep. 19, 2008 Page 57 of 1342
4
3
2
1
LSB
LSB
LSB
0
0
REJ09B0467-0100
Section 2 CPU
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