h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 210

• Manufacturer Part Number: h8s-2138
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 6 Bus Controller
6.6.2
Table 6.6 shows pin states in an idle cycle.
Table 6.6
Pins
A15 to A0, IOS
D7 to D0
AS
RD
WR
Rev. 4.00 Jun 06, 2006 page 156 of 1004
REJ09B0301-0400
Address bus
Data bus
WR
Pin States in Idle Cycle
RD
Pin States in Idle Cycle
(a) Idle cycle not inserted
T
1
Bus cycle A
Pin State
Contents of next bus cycle
High impedance
High
High
High
T
2
Figure 6.9 Example of Idle Cycle Operation
T
3
floating time
Long output
Bus cycle B
T
1
T
2
Data collision
Address bus
Data bus
WR
RD
T
1
Bus cycle A
T
(b) Idle cycle inserted
2
T
3
T
Bus cycle B
I
T
1
T
2