h8s-2158 Renesas Electronics Corporation., h8s-2158 Datasheet - Page 182

• Manufacturer Part Number: h8s-2158
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 6 Bus Controller
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 Jan 25, 2006 page 130 of 872
REJ09B0286-0300
CPCS1 (CPCSE = 1 and CFE = 0)
Figure 6.10 Bus Timing for 16-Bit, 3-State Access Space (Even Byte Access)
Note: * For external address space access, this signal is not output when the 256-kbyte expansion area
CS256 (CS256E = 1)
Read
Write
AS/IOS (IOSE = 1)
AS/IOS * (IOSE = 0)
Address bus
is accessed with CS256E = 1 and when the CP/CF expansion area is accessed with CPCSE = 1.
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