HD6433044 Hitachi Semiconductor, HD6433044 Datasheet - Page 40

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HD6433044

Manufacturer Part Number
HD6433044
Description
(HD64 Series) Hitachi Single-Chip Microcomputer
Manufacturer
Hitachi Semiconductor
Datasheet

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2.5.2 Memory Data Formats
Figure 2-8 shows the data formats on memory. The H8/300H CPU can access word data and
longword data on 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 ER7 (SP) is used as an address register to access the stack, the operand size should be word
size or longword size.
Data Type
1-bit data
Byte data
Word data
Longword data
Figure 2-8 Memory Data Formats
Address
Address L
Address L
Address 2M
Address 2M + 1
Address 2N
Address 2N + 1
Address 2N + 2
Address 2N + 3
25
MSB
MSB
MSB
7
7
6
Data Format
5
4
3
2
1
LSB
LSB
LSB
0
0

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