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137
φ
T
1
T
2
T
3
PA
7
to PA
4
(A
23
to A
20
)
Address bus
BRCR address
High-impedance
Figure 6.24 BRCR Write Timing
6.7.2
BREQ
Pin Input Timing
After driving the
BREQ
pin low, hold it low until
BACK
goes low. If
BREQ
returns to the high
level before
BACK
goes lows, the bus arbiter may operate incorrectly.
To terminate the external-bus-released state, hold the
BREQ
signal high for at least three states. If
BREQ
is high for too short an interval, the bus arbiter may operate incorrectly.
Содержание H8/3008
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