AT8xC51SND2C
Waveforms
Figure 156. External IDE 16-bit Bus Cycle - Data Read Waveforms
ALE
TLHLL
TLLRL
TRLRH
TRHLH
RD
TRLDV
TRHDZ
TRHDX
TRLAZ
TLLAX
TAVLL
P0
P2
A7:0
TAVRL
TAVDV
D7:0
Data In
A15:8
D15:8(1)
Data In
Note:
1. D15:8 is written in DAT16H SFR.
Figure 157. External IDE 16-bit Bus Cycle - Data Write Waveforms
ALE
TLHLL
TWHLH
TLLWL
TWLWH
WR
TAVWL
TLLAX
TAVLL
TQVWH
TWHQX
P0
P2
A7:0
D7:0
Data Out
A15:8
D15:8(1)
Data Out
Note:
1. D15:8 is the content of DAT16H SFR.
SPI Interface
Definition of Symbols
Table 196. SPI Interface Timing Symbol Definitions
Signals
Conditions
High
C
I
Clock
H
L
Data In
Data Out
Low
O
V
X
Z
Valid
No Longer Valid
Floating
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4341D–MP3–04/05