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參數資料
型號: W7411240
廠商: WINBOND ELECTRONICS CORP
英文描述: 4-BIT Microcontroller(4位的微控制器)
中文描述: 4位微控制器(第4位的微控制器)
文件頁數: 21/39頁
文件大小: 424K
代理商: W7411240
W741L240
Publication Release Date: May 1999
- 21 -
Revision A1
LCD Controller/Driver
The W741L240 can directly drive an LCD with 24 segment output pins and 4 common output pins for
a total of 24
×
4 dots. Option codes can be used to select one of five options for the LCD driving
mode: static, 1/2 bias 1/2 duty, 1/2 bias 1/3 duty, 1/3 bias 1/3 duty, or 1/3 bias 1/4 duty (see Figure
12). The alternating frequency of the LCD can be set as Fw/64, Fw/128, Fw/256, or Fw/512. The
structure of the LCD alternating frequency (F
LCD
) is shown in the figure below.
Timing
Generator
Q1
Q2
Q3
Q4
Q5
Q6
Q14
...
Fosc
Fosc/32
High frequency clock
Divider 0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
Q9
Fw
Selector
Fw/512
Fw/256
Fw/128
Fw/64
Low frequency clock
F
LCD
Figure 11. LCD Alternating Frequency (F
LCD
) Circuit Diagram
LCD Data RAM
(24 x 4 bits)
Common
Driver
LCD Voltage
Controller
Segment
Driver/Controller
Data Bus
COM0 to 3
SEG0 to 23
Clock
Generator
Fw
LCD Mode
Controller
V
DH1
DH2
Option Codes
LCD Duty & Bias
LCD Frequency
Selection
LCD Drive
Mode
Selection
LCD
Waveform
V
V
F
LCD
DD
SS
DD1 to 3
Figure 12. LCD Driver/Controller Circuit Diagram
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