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HD6432351 bảng dữ liệu(PDF) 183 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]
Trang chủ  http://www.renesas.com
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HD6432351 bảng dữ liệu(HTML) 183 Page - Renesas Technology Corp

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Section 6 Bus Controller
Rev. 3.00 Sep 15, 2006 page 149 of 988
REJ09B0330-0300
16-Bit Access Space
Figure 6.5 illustrates data alignment control for the 16-bit access space. With the 16-bit access
space, the upper data bus (D15 to D8) and lower data bus (D7 to D0) are used for accesses. The
amount of data that can be accessed at one time is one byte or one word, and a longword transfer
instruction is executed as two word transfer instructions.
In byte access, whether the upper or lower data bus is used is determined by whether the address is
even or odd. The upper data bus is used for an even address, and the lower data bus for an odd
address.
D15
D8 D7
D0
Upper data bus
Byte size
Word size
1st bus cycle
2nd bus cycle
Longword
size
• Even address
Byte size
• Odd address
Lower data bus
Figure 6.5 Access Sizes and Data Alignment Control (16-Bit Access Space)



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