h8s-2646 Renesas Electronics Corporation., h8s-2646 Datasheet - Page 186

• Manufacturer Part Number: h8s-2646
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 7 Bus Controller
7.4.4
8-Bit 2-State Access Space: Figure 7.5 shows the bus timing for an 8-bit 2-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 cannot be inserted.
Rev. 5.00 Sep 22, 2005 page 160 of 1136
REJ09B0257-0500
Basic Timing
Read
Write
Figure 7.5 Bus Timing for 8-Bit 2-State Access Space
Address bus
D15 to D8
D15 to D8
D7 to D0
D7 to D0
HWR
LWR
RD
AS
T
1
Bus cycle
High
High impedance
Valid
T
2
Invalid
Valid