h8s-2635 Renesas Electronics Corporation., h8s-2635 Datasheet - Page 228

• Manufacturer Part Number: h8s-2635
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 7 Bus Controller
16-Bit Access Space: Figure 7-4 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 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.
Rev. 6.00 Feb 22, 2005 page 168 of 1484
REJ09B0103-0600
Figure 7-4 Access Sizes and Data Alignment Control (16-Bit Access Space)
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