HD6412373R RENESAS [Renesas Technology Corp], HD6412373R Datasheet - Page 245
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HD6412373R
Manufacturer Part Number
HD6412373R
Description
Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6412373R.pdf
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16-Bit Access Space: Figure 6.9 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.
Figure 6.9 Access Sizes and Data Alignment Control (16-Bit Access Space)
Figure 6.8 Access Sizes and Data Alignment Control (8-Bit Access Space)
Byte size
Word size
Longword
size
Byte size
Byte size
Word size
Longword
size
• Even address
• Odd address
1st bus cycle
2nd bus cycle
1st bus cycle
2nd bus cycle
3rd bus cycle
4th bus cycle
1st bus cycle
2nd bus cycle
D15
D15
Upper data bus
Upper data bus
Rev.7.00 Mar. 18, 2009 page 177 of 1136
D8 D7
D8 D7
Section 6 Bus Controller (BSC)
Lower data bus
Lower data bus
REJ09B0109-0700
D0
D0
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