Datasheet

Table Of Contents
Section 6 Bus Controller
Page 130 of 846 REJ09B0140-0900 Rev. 9.00
Sep 16, 2010
H8S/2215 Group
8-Bit 3-State Access Space (Except Area 6): Figure 6.11 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.
Bus cycle
T
1
T
2
Address bus
φ
CSn
AS
RD
D15 to D8
Valid
D7 to D0
Invalid
Read
HWR
LWR
(16-bit bus
mode)
D15 to D8
Valid
D7 to D0
Write
High
Note: n = 0 to 5, 7
T
3
High impedance
High impedance
LWR
(8-bit bus
mode)
Figure 6.11 Bus Timing for 8-Bit 3-State Access Space (Except Area 6)