RCM2122R Ver la hoja de datos (PDF) - ROHM Semiconductor
Número de pieza
componentes Descripción
Fabricante
RCM2122R Datasheet PDF : 10 Pages
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Liquid Crystal Displays
(2) Reading (VDD=5V±5%, VSS=0V, Ta=0∼+50°C)
Parameter
Symbol
Min.
Enable cycle time
tCYCE
500
Enable pulse time
"H" leve
"L" level
PWEH
220
PWEL
280
Enable rise time / decay time
tEr,tEf
−
Set-up time
RS, R / W, E
tAS
40
Address hold time
tAH
10
Data set-up time
tDDR
−
Data hold time
tDHR
20
Max.
−
−
−
20
−
−
240
−
RS
R/W
E
DB0∼DB7
VIH1
VIL1
tAS
VIH1
VIL1
tAH
VIH1
PWEH
VIH1
tAH
tEf
VIL2
tEr
VIH2
tDDR
VOH1
VOL1
VIH2
VIL2
tDHR
PWEL
Valid data
tCYCE
VOH1
VOL1
VIL2
Fig.7
RCM2122R
Unit
ns
Fig.7
ns
Fig.7
ns
Fig.7
ns
Fig.7
ns
Fig.7
ns
Fig.7
ns
Fig.7
ns
Fig.7
!Pin function
Symbol Level
VSS
−
VDD
−
VO
−
RS
H/L
R/W H/L
I/O
−
0V
−
5.0V
3.0∼5.0V
−
(VDD∼VO)
Resistor select signal
0 : Instruction resistor (Write)
I
Busy flag address counter (Read)
1 : Data resistor (Read / Write)
Read (R) Write (W) Select signal
I
0 : Write MPU → LCD module
1 : Read MPU ← LCD module
Function
Ground electrical potential
Power voltage
LCD drive voltage set termination
VDD ≥ VO ≥ VSS
E H, H / L
I
Signal to start read or write data
DB4
H/L
DB7
Upper level 4 line data bus
I/O
Also DB7 is enable to use as busy flag
DB0
H/L
DB3
Lower level 4 line data bus
I/O
These pins are not used during 4-bits operation
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