h8s-2649 Renesas Electronics Corporation., h8s-2649 Datasheet - Page 158

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

Section 7 Bus Controller (BSC)
16-Bit, 2-State Access Space: Figures 7.7 to 7.9 show bus timings for a 16-bit, 2-state access
space. When a 16-bit access space is accessed, the upper half (D15 to D8) of the data bus is used
for odd addresses, and the lower half (D7 to D0) for even addresses. Wait states cannot be
inserted.
Rev. 2.00 Dec. 05, 2005 Page 120 of 724
REJ09B0200-0200
Write
Read
Figure 7.7 Bus Timing for 16-Bit, 2-State Access Space
φ
Address bus
AS
RD
D15 to D8
D7 to D0
HWR
LWR
D15 to D8
D7 to D0
(Even Address Byte Access)
T
1
Bus cycle
High
High impedance
Valid
T
2
Invalid
Valid