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H8SX1663 데이터시트(PDF) 89 Page - Renesas Technology Corp

부품명 H8SX1663
상세설명  Renesas 32-Bit CISC Microcomputer H8SX Family / H8SX/1600 Series
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제조업체  RENESAS [Renesas Technology Corp]
홈페이지  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

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Section 2 CPU
Rev.1.00 Jun. 07, 2006 Page 37 of 1102
REJ09B0294-0100
2.6.2
Memory Data Formats
Figure 2.13 shows the data formats in memory.
The H8SX CPU can access word data and longword data which are stored at any addresses in
memory. When word data begins at an odd address or longword data begins at an address other
than a multiple of 4, a bus cycle is divided into two or more accesses. For example, when
longword data begins at an odd address, the bus cycle is divided into byte, word, and byte
accesses. In this case, these accesses are assumed to be individual bus cycles.
However, instructions to be fetched, word and longword data to be accessed during execution of
the stack manipulation, branch table manipulation, block transfer instructions, and MAC
instruction should be located to even addresses.
When SP (ER7) is used as an address register to access the stack, the operand size should be word
size or longword size.
7
654
3
2
10
70
MSB
LSB
MSB
LSB
MSB
LSB
Data Type
Data Format
1-bit data
Byte data
Word data
Longword data
Address
Address L
Address L
Address 2M
Address 2M + 1
Address 2N
Address 2N + 1
Address 2N + 2
Address 2N + 3
Figure 2.13 Memory Data Formats



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