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H8/3028F Folha de dados(PDF) 56 Page - Renesas Technology Corp

Nome de Peças H8/3028F
Descrição Electrónicos  Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series
PDF  923 Pages
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Fabricante Electrônico  RENESAS [Renesas Technology Corp]
Página de início  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8/3028F Folha de dados(HTML) 56 Page - Renesas Technology Corp

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Rev. 2.00, 09/03, page 26 of 890
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.
76543210
Address L
Address L
LSB
MSB
MSB
LSB
70
MSB
LSB
1-bit data
Byte data
Word data
Longword data
Address
Data Type
Data Format
Address 2M
Address 2M + 1
Address 2N
Address 2N + 1
Address 2N + 2
Address 2N + 3
Figure 2.8 Memory Data Formats
When ER7 (SP) is used as an address register to access the stack, the operand size should be word
size or longword size.



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