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參數(shù)資料
| 型號(hào)： | S1C63466F |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 4.1 MHz, MICROCONTROLLER, PQFP144 |
| 封裝： | PLASTIC, QFP8-144 |
| 文件頁數(shù)： | 88/135頁 |
| 文件大?。?/td> | 1053K |
| 代理商： | S1C63466F |
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48
EPSON
S1C63466 TECHNICAL MANUAL
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (LCD Driver)
4.7.3 Mask option
Disconnecting the internal power supply for LCD driving will enable voltages to be supplied externally.
In such case, the five voltages are entered in VC1, VC2, VC3, VC4 and VC5 terminals and 1/5 bias driving
may then be set. Since 1/5 bias driving provides better display quality, when low power current con-
sumption is not required (i.e., when power is supplied from AC outlet), select external power mode.
However, note that in order to maintain a stable display, power source must be one which will remain
stable even when heavy load such as buzzer, etc. is driven.
Moreover, in the external power mode, the contrast adjustment function cannot be used. Accommodate
this limitation by utilizing the external circuit as necessary.
A sample circuit of external power for LCD driving when power is supplied externally is shown in Figure
4.7.3.1.
VDD
Rxx
VC5
VC4
VC3
VC2
VC1
VSS
S1C63466
Power save circuit
VDD (3 V)
VDD'
VSS (0 V)
5 V
4 V
3 V
2 V
1 V
Fig. 4.7.3.1 Sample circuit of external power for LCD driving when power is supplied externally
4.7.4 LCD display control (ON/OFF) and switching of duty
(1) Display ON/OFF control
The S1C63466 incorporates the ALON and ALOFF registers to blink display. When "1" is written to
ALON, all the dots go ON, and when "1" is written to ALOFF, all the dots go OFF. At such a time, an
ON waveform or an OFF waveform is output from SEG terminals. When "0" is written to these
registers, normal display is performed. Furthermore, when "1" is written to both of the ALON and
ALOFF, ALON (all ON) has priority over the ALOFF (all OFF).
(2) Switching of drive duty
In the S1C63466, the drive duty can be set to 1/17, 1/16 or 1/8 by the software. This setting is done
using the LDUTY1 and LDUTY0 registers as shown in Table 4.7.4.1.
Table 4.7.4.1 LCD drive duty setting
LDUTY1
1
0
LDUTY0
1
0
Drive duty
1/8
1/16
1/17
Common terminal used
COM0–COM7
COM0–COM15
COM0–COM16
Maximum segment number
480 (60
× 8)
960 (60
× 16)
1,020 (60
× 17)
Table 4.7.4.2 shows the frame frequencies corresponding to the OSC1 oscillation frequency and drive
duty.
Table 4.7.4.2 Frame frequency
OSC1 oscillation
frequency
32.768 kHz
60 kHz
When 1/8 duty
is selected
32 Hz
58.6 Hz
When 1/16 duty
is selected
32 Hz
58.6 Hz
When 1/17 duty
is selected
30.12 Hz
55.2 Hz
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