Spi interface, At8xc51snd1c – Rainbow Electronics AT89C51SND1C User Manual
Page 190
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190
AT8xC51SND1C
4109E–8051–06/03
Waveforms
Figure 144. External IDE 16-bit Bus Cycle - Data Read Waveforms
Note:
1. D15:8 is written in DAT16H SFR.
Figure 145. External IDE 16-bit Bus Cycle - Data Write Waveforms
Note:
1. D15:8 is the content of DAT16H SFR.
SPI Interface
Definition of Symbols
Table 165. SPI Interface Timing Symbol Definitions
T
AVDV
T
LLAX
T
RHDX
T
RHDZ
T
AVLL
T
AVRL
P2
P0
RD
ALE
T
LHLL
T
RLRH
Data In
T
RLAZ
T
LLRL
T
RHLH
T
RLDV
D7:0
A7:0
Data In
D15:8
(1)
A15:8
T
WHLH
T
AVWL
T
LLAX
T
WHQX
P2
P0
WR
ALE
T
LHLL
T
WLWH
T
AVLL
T
QVWH
D7:0
Data Out
T
LLWL
A7:0
D15:8
(1)
Data Out
A15:8
Signals
Conditions
C
Clock
H
High
I
Data In
L
Low
O
Data Out
V
Valid
X
No Longer Valid
Z
Floating
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