h8s-2161b Renesas Electronics Corporation., h8s-2161b Datasheet - Page 190

• Manufacturer Part Number: h8s-2161b
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 6 Bus Controller (BSC)
16-Bit, 3-State Access Space: Figures 6.10 to 6.12 show bus timings for a 16-bit, 3-state access
space. When a 16-bit access space is accessed, the upper half (D15 to D8) of the data bus is used
for even addresses, and the lower half (D7 to D0) for odd addresses. Wait states can be inserted.
Rev. 3.00 Mar 21, 2006 page 136 of 788
REJ09B0300-0300
Figure 6.10 Bus Timing for 16-Bit, 3-State Access Space (Even Byte Access)
Read
Write
AS/IOS (IOSE = 0)
AS/IOS (IOSE = 1)
Address bus
D15 to D8
D15 to D8
D7 to D0
D7 to D0
HWR
LWR
RD
T
1
High level
Bus cycle
T
Undefined
2
Valid
T
3
Invalid
Valid