RCM2228R-B データシートの表示（PDF） - ROHM Semiconductor
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RCM2228R-B Datasheet PDF : 8 Pages
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Liquid Crystal Displays
zTerminal function
Symbol
VDD
VSS
V0
DB4∼DB7
I / O Terminal
Input
Input
Input
Input / Output
RS
Input
R/W
E
Input
Input
Function
VDD=4.75∼5.25V
VSS=0V
LCD driving voltage input terminal VDD ≥ V0 ≥ VSS
Data bus four-state bi-directional
Register selected signal
L: Instruction register (at write)
L: Busy flag / address counter (at read)
H: Data register (at write & read)
Read / Write select signal L: Write H : Read
Data Read / Write enable signal
zTiming chart
Writing
RS
R/W
CSB
E
D0 to D7
(Write)
D0 to D7
(Read)
tAW6
tAH6
tEWH
tCYC6
tEWL
tr
tf
tDS6
tDH6
tACC6
tOH6
Fig.6 interface (Write Operation)
RCM2228R-A / B
Item
Terminal Symbol
Min.
Max.
Unit
Address hold time
Address set up time
RS
tAH6
20
−
ns
RS
tAW6
20
−
System cycle time
RS
tCYC6
150
−
ns
Data setup time
D0 to D7
tDS6
80
−
ns
Data hold time
D0 to D7
tDH6
20
−
ns
Access time
D0 to D7
tACC6
−
400
ns
Output disable time
D0 to D7
tOH6
150
−
ns
“E” rise / fall time
E
tr, tf
−
20
ns
“E” pulse width H level
E
tEWH
120
−
ns
“E” pulse width L level
E
tEWL
30
−
ns
∗ In designing, please set the timing with sufficient margin
4/7
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