AT89C5132
23.3.2.3
Waveforms
Figure 23-10. 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
D7:0
Data In
TAVRL
TAVDV
A15:8
D15:81
Data In
Note:
D15:8 is written in DAT16H SFR.
Figure 23-11. 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
D15:81
Data Out
Note:
D15:8 is the content of DAT16H SFR.
23.3.3
SPI Interface
23.3.3.1
Definition of Symbols
Table 114. 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No Longer Valid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
163
4173E–USB–09/07
ATMEL [ ATMEL ]
