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參數(shù)資料
| 型號： | S1C621C0D |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 1.3 MHz, MICROCONTROLLER, UUC74 |
| 封裝： | DIE-74 |
| 文件頁數(shù)： | 41/108頁 |
| 文件大小： | 992K |
| 代理商： | S1C621C0D |
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30
EPSON
S1C621C0 TECHNICAL MANUAL
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (LCD Driver)
4.7 LCD Driver (COM0–COM3, SEG0–SEG33)
4.7.1 Configuration of LCD driver
The S1C621C0 has 4 common terminals (COM0–COM3) and 34 segment terminals (SEG0–SEG33), so that it
can drive an LCD with a maximum of 136 (34
× 4) segments.
The power for driving the LCD is generated by the internal circuit so that there is no need to apply power
especially from outside.
The driving method is 1/2 duty dynamic drive depending on the four types of potential, VSS, VC1, VC2 and
VC3. In addition to the 1/2 duty, 1/3 and 1/4 drive duty can be selected by the software. The frame
frequency is 32 Hz for 1/4 and 1/2 duty, and 42.7 Hz for 1/3 duty (fOSC1 = 32.768 kHz).
LCD display ON/OFF may be controlled by the software.
Note: "fOSC1" indicates the oscillation frequency of the OSC1 oscillation circuit.
4.7.2 LCD drive voltage
The LCD drive voltage VC1 is generated by the LCD system regulated voltage circuit, and VC2 and VC3 are
generated by boosting the VC1 voltage with the LCD system voltage booster circuit.
The VC1 voltage can be adjusted to match the LCD panel characteristics using the VADJ terminal. See
Section 2.1.2, "Voltage <VC1, VC2 and VC3> for LCD driving" for the VC1 adjustment method.
The LCD system power circuit that generates VC1–VC3 is turned ON and OFF by the LCD power control
register LPWR.
By setting LPWR to "1", the LCD system power circuit generates VC1–VC3. When LPWR is set to "0", VC1–
VC3 become VSS level. In this case, all outputs from the COM terminals and SEG terminals go to VSS level.
To display the LCD, the LCD drive power must be ON by previously setting LPWR to "1".
SEG output ports that are set for DC output by the mask option operate same as the output (R) port
regardless of the power ON/OFF control.
4.7.3 LCD display ON/OFF control and duty switching
(1) Display ON/OFF control
In the S1C621C0, ON/OFF of the LCD display can be controlled by the LOFF register.
At initial reset, LOFF is set to "0", and the LCD display is set to the ON status.
The LCD power is OFF at initial reset, so the display is actually performed when the LCD power is
turned ON (LPWR = "1").
To set all of the LCD display OFF, write "1" to LOFF. With this, the SEG terminals output an OFF
waveform.
(2) Switching of drive duty
By setting the registers LDTY0 and LDTY1, the LCD drive duty can be selected from among 3 types, 1/
4, 1/3 and 1/2 duty. Table 4.7.3.1 shows the LCD drive duty setting.
Table 4.7.3.1 LCD drive duty setting
Basically you should select the drive duty with the smallest drive segment number (for example, 1/3
duty for 100 segments and 1/2 duty for 60 segments) from among the drive duties permitting driving
of the segment number of the LCD panel.
Figures 4.7.3.1–4.7.3.3 show the dynamic drive waveform for 1/4 duty, 1/3 duty and 1/2 duty.
LDTY1
0
1
LDTY0
0
1
X
Duty
1/2
1/3
1/4
COM0, COM1
COM0–COM2
COM0–COM3
Frame frequency *
fOSC1/1,024 (32 Hz)
fOSC1/768 (42.7 Hz)
fOSC1/1,024 (32 Hz)
68 (34
× 2)
102 (34
× 3)
136 (34
× 4)
Terminals used
in common
Maximum number
of segments
* In case of fOSC1 = 32.768 kHz
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