SC63C0316

HANGZHOU SILAN MICROELECTRONICS CO.,LTD

REV:1.0

2004.08.03

Http: www.silan.com.cn

Page 21 of 24

Table12. Maximum Number of Display Digits Per Duty Cycle

LCD Duty

LCD Bias

COM Output Pins

Maximum Digit Display 8 Segment Pins)

Static

Static

COM0

4

1/2

1/2

COM0–COM1

8

1/3

1/2

COM0–COM2

12

1/3

1/3

COM0–COM2

12

1/4

1/3

COM0–COM3

16

Table 13. LCD Mode Control Register (LMOD) Organization (8-Bit W)

LMOD.7

LCD voltage dividing register control bit

0

Internal voltage dividing resistor.

1

External voltage dividing resistor; internal voltage dividing resistors are off.

LMOD.6

Always logic zero

LMOD.5

LMOD.4

LCD Clock (LCDCK) Frequency

0

0

fw/2

0

1

fw/2

1

0

fw/2

1

1

fw/2

LMOD.3

LMOD.2

LMOD.1

LMOD.0

Duty and Bias Selection for LCD Display

0

x

x

x

LCD display off

1

0

0

0

1/4 duty, 1/3 bias

1

0

0

1

1/3 duty, 1/3 bias

1

0

1

0

1/2 duty, 1/2 bias

1

0

1

1

1/3 duty, 1/2 bias

1

1

0

0

Static

NOTE:'x' means 'don't care'.

LCD DRIVE VOLTAGE

The LCD display is turned on only when the voltage difference between the common and segment signals is

greater than VLCD. The LCD display is turned off when the difference between the common and segment signal

voltages is less than VLCD.

NOTE: The LCD panel display may deteriorate if a DC voltage is applied that lies between the common and

segment signal voltage. Therefore, always drive the LCD panel with AC voltage

COMMON (COM) SIGNALS

The common signal output pin selection (COM pin selection) varies according to the selected duty cycle.