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H8SX1663 Datasheet(PDF) 242 Page - Renesas Technology Corp

Part # H8SX1663
Description  Renesas 32-Bit CISC Microcomputer H8SX Family / H8SX/1600 Series
PDF  1158 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8SX1663 Datasheet(HTML) 242 Page - Renesas Technology Corp

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Section 6 Bus Controller (BSC)
Rev.1.00 Jun. 07, 2006 Page 190 of 1102
REJ09B0294-0100
Longword
Access
Address
Access
Count
15
15
23
16
24
31
Data
Size
Byte
Byte
Byte
Byte
Byte
Byte
Byte
Byte
Word
1
1st
1st
2nd
1st
2nd
3rd
4th
2
4
Bus
Cycle
Data Size
Data bus
D15
D8 D7
D0
RD
7
7
7
0
8
0
8
0
LHWR/LUB
LLWR/LLB
Strobe signal
n
n
n
Figure 6.12 Access Sizes and Data Alignment Control for 8-Bit Access Space
(Little Endian)
(2) 16-Bit Access Space
With the 16-bit access space, the upper byte data bus (D15 to D8) and lower byte 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.
Figures 6.13 and 6.14 illustrate data alignment control for the 16-bit access space. Figure 6.13
shows the data alignment when the data endian format is specified as big endian. Figure 6.14
shows the data alignment when the data endian format is specified as little endian.
In big endian, byte access for an even address is performed by using the upper byte data bus and
byte access for an odd address is performed by using the lower byte data bus.
In little endian, byte access for an even address is performed by using the lower byte data bus, and
byte access for an odd address is performed by using the third byte data bus.



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