h8s-2158 Renesas Electronics Corporation., h8s-2158 Datasheet - Page 178

• 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
8-Bit, 3-State Access Space: Figure 6.6 shows the bus timing for an 8-bit, 3-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 can be inserted.
Rev. 3.00 Jan 25, 2006 page 126 of 872
REJ09B0286-0300
CPCS1 (CPCSE = 1 and CFE = 0)
Note: * For external address space access, this signal is not output when the 256-kbyte expansion area
CS256 (CS256E = 1)
AS/IOS * (IOSE = 0)
is accessed with CS256E = 1 and when the CP/CF expansion area is accessed with CPCSE = 1.
Read
AS/IOS (IOSE = 1)
Write
Figure 6.6 Bus Timing for 8-Bit, 3-State Access Space
Address bus
D15 to D8
D15 to D8
D7 to D0
HWR
RD
T
1
Bus cycle
T
2
Valid
T
3
Invalid
Valid