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H83065 Datasheet(PDF) 175 Page - Renesas Technology Corp

Part # H83065
Description  Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series
PDF  963 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H83065 Datasheet(HTML) 175 Page - Renesas Technology Corp

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Section 6 Bus Controller
Rev. 4.00 Jan 26, 2006 page 153 of 938
REJ09B0276-0400
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
Lower data bus
1st bus cycle
2nd bus cycle
Byte size
Longword size
· Even address
· Odd address
Word size
Byte size
Figure 6.8 Access Sizes and Data Alignment Control (16-Bit Access Area)
6.4.3
Valid Strobes
Table 6.4 shows the data buses used, and the valid strobes, for the access spaces.
In a read, the
RD signal is valid for both the upper and the lower half of the data bus.
In a write, the
HWR signal is valid for the upper half of the data bus, and the LWR signal for the
lower half.



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