HD6413008F RENESAS [Renesas Technology Corp], HD6413008F Datasheet - Page 167

• Manufacturer Part Number: HD6413008F
• Description: Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series
• Manufacturer: RENESAS [Renesas Technology Corp]

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.
6.4.3
Table 6.4 shows the data buses used, and the valid strobes, for the access spaces.
In a read, the RD signal is valid for both the upper and the lower half of the data bus.
In a write, the HWR signal is valid for the upper half of the data bus, and the LWR signal for the
lower half.
Byte size
Byte size
Word size
Longword size
Figure 6.8 Access Sizes and Data Alignment Control (16-Bit Access Area)
Valid Strobes
• Even address
• Odd address
1st bus cycle
2nd bus cycle
D
15
Upper data bus
Rev.4.00 Aug. 20, 2007 Page 123 of 638
D
8
D
7
Lower data bus
REJ09B0395-0400
6. Bus Controller
D
0