S3C8235 Datasheet, PDF (274/340 Pages) Samsung semiconductor – 8-BIT CMOS MICROCONTROLLERS USERS MANUAL

   


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The LCD display is turned on only when the voltage difference between the common and segment signals is
greater than V
_. The LCD display is turned off when the difference between the common and segment signal
voltages is less than V
_ The turn-on voltage, + V
_ or - V
_, is generated only when both signals are the
selected signals of the bias. Table 14-7 shows LCD drive voltages for static mode, 1/3 bias, and 1/4 bias.
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V
_
V
_
V
_
V
_
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V
_
–
–
–
0V
2- 
–
V
_
2/3 V
_
1/3 V
_
0V
2 - 
V
_
3/4 V
_
2/4 V
_
1/4 V
_
0V

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The 24 LCD segment signal pins are connected to corresponding display RAM locations at 00H-17H. Bits 0-7 of
the display RAM are synchronized with the common signal output pins COM0, . . . . , and COM7.
When the bit value of a display RAM location is "1", a select signal is sent to the corresponding segment pin.
When the display bit is "0", a 'no-select' signal is sent to the corresponding segment pin. Each bias has select and
no-select signals.


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