h8s-2649 Renesas Electronics Corporation., h8s-2649 Datasheet - Page 157

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

8-Bit, 3-State Access Space: Figure 7.6 shows the bus timing for an 8-bit, 3-state access space.
When an 8-bit access space is accessed, the upper half (D15 to D8) of the data bus is used. The
LWR pin is always fixed high. Wait states can be inserted.
Read
Write
Address bus
AS
RD
D15 to D8
D7 to D0
HWR
LWR
D15 to D8
D7 to D0
φ
Figure 7.6 Bus Timing for 8-Bit, 3-State Access Space
T
1
High impedance
Bus cycle
High
T
2
Rev. 2.00 Dec. 05, 2005 Page 119 of 724
Valid
Section 7 Bus Controller (BSC)
T
3
Invalid
Valid
REJ09B0200-0200