HD6412320 RENESAS [Renesas Technology Corp], HD6412320 Datasheet - Page 201
HD6412320
Manufacturer Part Number
HD6412320
Description
Renesas 16-Bit Single-Chip Microcomputer H8S Family H8S-2300 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6412320.pdf
(1302 pages)
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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 (D
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.
Figure 6.5 Access Sizes and Data Alignment Control (16-Bit Access Space)
Byte size
Byte size
Word size
Longword
size
• Even address
• Odd address
1st bus cycle
2nd bus cycle
D
Upper data bus
15
15
to D
Rev.6.00 Sep. 27, 2007 Page 171 of 1268
8
) and lower data bus (D
D
8
D
Lower data bus
7
Section 6 Bus Controller
REJ09B0220-0600
7
to D
D
0
0
) are used
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