ST7781
8.2 Timing Chart
Parallel Interface Characteristics: 18, 16, 9 or 8-bits Bus (8080-Series MCU Interface)
V
IH
/CS
V
IL
V
IH
RS
V
IL
TAST
TAHT
TWRH
TWC
TWRL
V
IH
/WR
V
IL
TDST
TDHT
V
Data Bus
Write
IH
V
IL
TAHT
TAST
TRC
TRDL
V
IH
TRDH
TODH
/RD
V
IL
TRAT
V
IH
Data Bus
Read
V
IL
Fig. 8.2.1 Parallel Interface Timing Characteristics (8080-Series MCU Interface)
VDDI=1.65 to 3.3V, VDD=2.5 to 3.3V, AGND=DGND=0V, Ta=25
℃
Signal
Symbol
Parameter
Address Setup Time
Address Hold Time (Write/Read)
Write Cycle
Control Pulse “H” Duration
Control Pulse “L” Duration
Read Cycle
Control Pulse “H” Duration
Control Pulse “L” Duration
Data Setup Time
Min
10
5
100
50
50
300
150
150
10
Max
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
Description
TAST
TAHT
TWC
TWRH
TWRL
TRC
TRDH
TRDL
TDST
-
-
-
-
-
-
-
-
-
RS
/WR
/RD
TRAT, TRATFM: 3K ohm
Pullup or Down and 30pF
Parallel Cap. To GND.
TODH: 3K ohm Pullup or
Down.
TDHT
TRAT
TODH
Data Hold Time
15
-
-
100
-
ns
ns
ns
DB[17:0]
Read Access Time
Output Disable Time
50
Table 8.2.1: Parallel Interface Characteristics
Fig. 8.2.2 Rising and Falling Timing for I/O Signal
Ver. 1.7
26
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