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HD6432351 bảng dữ liệu(PDF) 71 Page - Renesas Technology Corp

tên linh kiện HD6432351
Giải thích chi tiết về linh kiện  16-Bit Single-Chip Microcomputer
PDF  1025 Pages
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nhà sản xuất  RENESAS [Renesas Technology Corp]
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HD6432351 bảng dữ liệu(HTML) 71 Page - Renesas Technology Corp

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Section 2 CPU
Rev. 3.00 Sep 15, 2006 page 37 of 988
REJ09B0330-0300
2.5.2
Memory Data Formats
Figure 2.11 shows the data formats in memory. The 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.
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 2.11 Memory Data Formats
When ER7 is used as an address register to access the stack, the operand size should be word size
or longword size.



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