h8s-2646 Renesas Electronics Corporation., h8s-2646 Datasheet - Page 187

• Manufacturer Part Number: h8s-2646
• 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 fixed high. Wait states can be inserted.
Read
Write
Address bus
D15 to D8
D15 to D8
D7 to D0
D7 to D0
Figure 7.6 Bus Timing for 8-Bit 3-State Access Space
HWR
LWR
RD
AS
T
1
High impedance
Bus cycle
High
Rev. 5.00 Sep 22, 2005 page 161 of 1136
T
2
Valid
Section 7 Bus Controller
T
3
Invalid
Valid
REJ09B0257-0500