h8s-2158 Renesas Electronics Corporation., h8s-2158 Datasheet - Page 177

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

6.5.3
8-Bit, 2-State Access Space: Figure 6.5 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. Wait
states cannot be inserted.
CPCS1 (CPCSE = 1 and CFE = 0)
Basic Operation Timing
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 = 0)
AS/IOS (IOSE = 1)
is accessed with CS256E = 1 and when the CP/CF expansion area is accessed with CPCSE = 1.
Figure 6.5 Bus Timing for 8-Bit, 2-State Access Space
Address bus
D15 to D8
D15 to D8
D7 to D0
HWR
RD
T
1
Bus cycle
Rev. 3.00 Jan 25, 2006 page 125 of 872
Valid
T
2
Invalid
Valid
Section 6 Bus Controller
REJ09B0286-0300