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H83069RF bảng dữ liệu(PDF) 49 Page - Renesas Technology Corp

tên linh kiện H83069RF
Giải thích chi tiết về linh kiện  Renesas 16-Bit Single-Chip Microcomputer
PDF  1003 Pages
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H83069RF bảng dữ liệu(HTML) 49 Page - Renesas Technology Corp

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Rev. 5.0, 09/04, page 27 of 978
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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