161
φ
RD
BACK
(1)
(2)
(3)
(4)
(5)
(6)
BREQ
HWR
,
LWR
T
0
T
1
T
2
AS
Data bus
Address bus
CPU cycles
CPU cycles
External bus released
High
Address
Minimum 3 cycles
High-impedance
High-impedance
High-impedance
High-impedance
High-impedance
Figure 6.21 Example of External Bus Master Operation
When making a transition to software standby mode, if there is contention with a bus request from
an external bus master, the
BACK
and strobe states may be indefinite when the transition is made.
When using software standby mode, clear the BRLE bit to 0 in BRCR before executing the
SLEEP instruction.
Содержание H8/3060
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