H8S-2350 RENESAS [Renesas Technology Corp], H8S-2350 Datasheet - Page 183

• Manufacturer Part Number: H8S-2350
• Description: 16-Bit Single-Chip Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

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
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
15
to D
8
) and lower data bus (D
D
Upper data bus
15
Rev. 3.00 Sep 15, 2006 page 149 of 988
7
to D
D
0
8
) are used for accesses. The
D
Lower data bus
7
Section 6 Bus Controller
REJ09B0330-0300
D
0