
15-6
ML63326 User's Manual
Chapter 15 LCD Driver (LCD)
Figure 15-2 Bias Generator Configuration for 1/5 Bias
15.5 Bias Generator (BIAS)
The bias generator is used to multiply and divide the voltage (V
DD2
) generated in the constant
voltage circuit with an external capacitor connected to pins C1, C2 to generate V
DD1
to V
DD5
bias voltages for the LCD driver.
The LCD power down mode stops the voltage lowering/raising operation of the bias
generation circuit in order to reduce supply current.
Figure 15-2 shows the bias generator configuration for 1/5 bias, and Figure 15-3 shows the
configuration for 1/4 bias.
For details of the voltage doubler circuit and the constant-voltage circuit, see Chapter 17,
"Power Supply Circuit."
Tables 15-2 and 15-3 list the display contrast adjusting voltages.
Voltage
doubler
circuit
Display contrast adjustment
(CN3–0)
1/5 bias select
(BISEL = "0")
To LCD driver
Constant voltage
circuit
BIAS
generator
V
DDH
CB1
CB2
V
DD5
V
DD4
V
DD3
V
DD2
V
DD1
V
SS
C1
V
SS
C2
C
12
C
a
C
b
C
c
C
d
C
e
C
b12
Power down mode select
(PDWN = "1")
V
DDL
C
l
C
h
V
DD
To high-speed clock generator circuit
Summary of Contents for ML63326
Page 3: ......
Page 13: ......
Page 14: ...Chapter 1 Overview 1 ...
Page 15: ......
Page 37: ...1 22 ML63326 User s Manual Chapter 1 Overview ...
Page 38: ...Chapter 2 CPU and Memory Spaces 2 ...
Page 39: ......
Page 50: ...CPU Control Functions Chapter 3 3 ...
Page 51: ......
Page 57: ...3 6 ML63326 User s Manual Chapter 3 CPU Control Functions ...
Page 58: ...Interrupt INT326 Chapter 4 4 ...
Page 59: ......
Page 71: ...4 12 ML63326 User s Manual Chapter 4 Interrupt INT326 ...
Page 72: ...Clock Generator Circuit OSC Chapter 5 5 ...
Page 73: ......
Page 83: ...5 10 ML63326 User s Manual Chapter 5 Clock Generator Circuit OSC ...
Page 84: ...Time Base Counter TBC Chapter 6 6 ...
Page 85: ......
Page 90: ...Timers TIMER Chapter 7 7 ...
Page 91: ......
Page 115: ...7 24 ML63326 User s Manual Chapter 7 Timers TIMER ...
Page 116: ...Chapter 8 8 100 Hz Timer Counter 100HzTC ...
Page 117: ......
Page 121: ...8 4 ML63326 User s Manual Chapter 8 100 Hz Timer Counter 100HzTC ...
Page 122: ...Chapter 9 9 Watchdog Timer WDT ...
Page 123: ......
Page 128: ...Chapter 10 10 Ports INPUT OUTPUT I O PORT ...
Page 129: ......
Page 170: ...Chapter 11 11 External Memory Transfer Function EXTMEM ...
Page 171: ......
Page 179: ...11 8 ML63326 User s Manual Chapter 11 External Memory Transfer Function EXTMEM ...
Page 180: ...Chapter 12 12 Melody Driver MELODY63K ...
Page 181: ......
Page 195: ...12 14 ML63326 User s Manual Chapter 12 Melody Driver MELODY63K ...
Page 196: ...13 Chapter 13 Voice Synthesis ...
Page 197: ......
Page 228: ...14 Chapter 14 Shift Register SFT ...
Page 229: ......
Page 236: ...15 Chapter 15 LCD Driver LCD ...
Page 237: ......
Page 250: ...16 Chapter 16 Battery Low Detect Circuit BLD ...
Page 251: ......
Page 255: ...16 4 ML63326 User s Manual Chapter 16 Battery Low Detect Circuit BLD ...
Page 256: ...Chapter 17 17 Power Supply Circuit POWER ...
Page 257: ......
Page 260: ...Appendixes ...
Page 261: ......
Page 321: ...Appendix 60 ML63326 User s Manual Appendix G ...