Datasheet

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
LALE VValid
Q Data Out X No Longer Valid
RRD
ZFloating
WWR