At8xc51snd1c – Rainbow Electronics AT89C51SND1C User Manual
Page 188
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188
AT8xC51SND1C
4109E–8051–06/03
Figure 143. External 8-bit Bus Cycle - Data Write Waveforms
External IDE 16-bit Bus Cycles
Definition of Symbols
Table 162. External IDE 16-bit Bus Cycles Timing Symbol Definitions
T
WHLH
T
AVWL
T
LLAX
T
WHQX
P2
P0
WR
ALE
T
LHLL
T
WLWH
A15:8
T
AVLL
T
QVWH
D7:0
Data Out
T
LLWL
A7:0
Signals
Conditions
A
Address
H
High
D
Data In
L
Low
L
ALE
V
Valid
Q
Data Out
X
No Longer Valid
R
RD
Z
Floating
W
WR
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