參數資料
型號: S1C621A0F0A0100
元件分類: 微控制器/微處理器
英文描述: MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁數: 109/161頁
文件大?。?/td> 1037K
代理商: S1C621A0F0A0100
S1C621A0 TECHNICAL HARDWARE
EPSON
I-27
CHAPTER 3: PERIPHERAL CIRCUITS (LCD Driver)
3.7 LCD Driver (COM0–COM3, SEG0–SEG31)
The S1C621A0 has four common pins and 32 segment pins,
which can drive a maximum of 128 (32
× 4) segments LCD.
The LCD driving power is generated on-chip and need not be
supplied by an external source (see section 3.2 "Power
Supply"). The LCDs are dynamically driven with a 1/4 duty
using four voltages (VDD, VL1, VL2 and VL3). (A 1/3 duty can
also be used by using mask option.) The frame frequency is
1/512 times the OSC1 oscillation frequency in the 1/4 duty
mode, and 1/384 times in the 1/3 duty mode. Table 3.7.1
shows the differences LCD driving mode options. Figures
3.7.1 and 3.7.2 show 1/3 and 1/4 duty mode driving wave-
forms.
Table 3.7.1
LCD Drive Mode Options
1/4
1/3
Duty
COM0–COM3
COM0–COM2
COM pins used
128 (32
× 4)
96 (32
× 3)
Max. number of segments
fOSC1 / 512
fOSC1 / 384
Frame frequency
64 Hz
85 Hz
When fOSC1 = 32 kHz
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