EM65571 ELAN Microelectronics Corp, EM65571 Datasheet - Page 97

• Manufacturer Part Number: EM65571
• Description: 130com / 128seg 65k Color Stn Lcd Driver
• Manufacturer: ELAN Microelectronics Corp

Product Specification (V1.0) 08.04.2005
(This specification is subject to change without further notice)
In order to prevent a transient voltage from being generated when an electronic volume
code is set, the circuit is designed in such a way that the set value is not reflected
immediately as a level but only after the upper bits (DV6-DV4) of the electronic code have
been set. The set value becomes valid when the lower bits (DV3-DV0) of the electronic
control volume code have also been set.
8.2.19 Resistance Ratio of CR Oscillator
Note: During a reset: {RF2, RF1, RF0} = 0H, read address: DH
The RF registers can control the resistance ratio of the CR oscillator. Therefore the frame
frequency can change the RF register setting.
When changing the RF register value, the LCD display quality should be checked.
8.2.20 Extended Power Control
Note: During a reset: {HPM, DIS} = 0H, {BF1, BF0}= 0H; read address: EH
D7
D7
1
1
RF2
0
0
0
0
1
1
1
1
The asterisk “*” mark means “Don’t care”
D6
D6
1
1
DIS
The DIS register can control capacitors discharge that are connected between the
power supply V0-V4 for LCD driver voltage and VSS.
When using this register, refer to 7-30 (Discharge circuit).
HPM
DIS = “0”: Discharge OFF
DIS = “1”: Discharge start
The HPM register is the power control for the liquid crystal driver power supply
HPM= “H”: High power mode
HPM= “L”: Normal mode
circuit.
D5
D5
0
1
RF1
0
0
1
1
0
0
1
1
D4
D4
1
0
BF1 BF0 HPM DIS
D3
D3
*
RF0
RF2 RF1 RF0
D2
D2
0
1
0
1
0
1
0
1
D1
D1
Initial Resistance Ratio
0.7 times the Initial Resistance Ratio
0.85 times the Initial Resistance Ratio
1.15 times the Initial Resistance Ratio
1.3 times the Initial Resistance Ratio
Code Prohibited
Code Prohibited
Code Prohibited
D0
D0
130COM/128SEG 65K Color STN LCD Driver
CSB RS RDB
CSB
0
0
1
RS
1
Operation
1
RDB WRB RE2 RE1 RE0
1
WRB
0
0
RE2 RE1 RE0
1
1
EM65571
0
0
x 91
0
0