p2125vps20 Renesas Electronics Corporation., p2125vps20 Datasheet - Page 160

• Manufacturer Part Number: p2125vps20
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 6 Bus Controller (BSC)
Table 6.5 shows the pin states in an idle cycle.
Table 6.5
Rev. 1.00 Sep. 21, 2006 Page 122 of 658
REJ09B0310-0100
Pins
A15 to A0, IOS
D7 to D0
AS
RD
WR
Address bus
Data bus
Pin States in Idle Cycle
WR
RD
φ
(a) No idle cycle insertion
T
1
Bus cycle A
Long output floating time
Figure 6.10 Examples of Idle Cycle Operation
T
2
T
3
Bus cycle B
T
1
T
2
Data collision
Address bus
Pin State
Contents of immediately following bus cycle
High impedance
High
High
High
Data bus
RD
WR
φ
T
1
Bus cycle A
T
(b) Idle cycle insertion
2
T
3
T
I
Bus cycle B
T
1
T
2