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HD64F2149YV bảng dữ liệu(PDF) 177 Page - Renesas Technology Corp

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Giải thích chi tiết về linh kiện  Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2100 Series
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HD64F2149YV bảng dữ liệu(HTML) 177 Page - Renesas Technology Corp

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Section 6 Bus Controller
Rev. 3.00 Jan 18, 2006 page 149 of 1044
REJ09B0280-0300
16-Bit Access Space: Figure 6.4 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 access is executed as two word accesses.
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 6.4 Access Sizes and Data Alignment Control (16-Bit Access Space)



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