h8s-2649 Renesas Electronics Corporation., h8s-2649 Datasheet - Page 155

• Manufacturer Part Number: h8s-2649
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

7.5.2
Table 7.3 shows the data buses used and 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.
Table 7.3
Note: Hi-Z: High-impedance state
Area
8-bit access
space
16-bit access
space
Invalid: Input state; input value is ignored.
Valid Strobes
Data Buses Used and Valid Strobes
Access
Size
Byte
Byte
Word
Read/
Write
Read
Write
Read
Write
Read
Write
Address
—
—
Even
Odd
Even
Odd
—
—
Valid
Strobe
RD
HWR
RD
HWR
LWR
RD
HWR, LWR
Rev. 2.00 Dec. 05, 2005 Page 117 of 724
Upper Data Bus
(D15 to D8)
Valid
Valid
Invalid
Valid
Hi-Z
Valid
Valid
Section 7 Bus Controller (BSC)
Lower Data
Bus (D7 to D0)
Invalid
Hi-Z
Invalid
Valid
Hi-Z
Valid
Valid
Valid
REJ09B0200-0200