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參數資料
型號: W741C260
廠商: WINBOND ELECTRONICS CORP
元件分類: 微控制器/微處理器
英文描述: 4-BIT Microcontroller(多次可編程4位的微控制器)
中文描述: 4-BIT, MROM, 4.19 MHz, MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁數: 25/92頁
文件大小: 488K
代理商: W741C260
W741C260
Publication Release Date: March 1998
- 25 -
Revision A3
LCD Controller/Driver
The W741C260 can directly drive an LCD with 32 segment output pins and 4 common output pins for
a total of 32
×
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. In
addition, option codes can also be used to set up four of the LCD driver output pins (segment 0 to
segment 31) as a DC output port. The structure of the LCD alternating frequency (F
LCD
) is shown in
the figure below.
Fs
Fosc or Fosc/32
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
Q9
Fw
Selector
Fw/512
Fw/256
Fw/128
Fw/64
F
LCD
Mask Option
(Single/Dual Clock)
Figure 11. LCD Alternating Frequency (FLCD) Circuit Diagram
LCD Data RAM
(32 x 4 bits)
Commom
Driver
LCD Voltage
Controller
Segment
Driver/Controller
Data Bus
COM0 to 3
SEG0 to 31
Clock
Generator
Fw
LCD Mode
Controller
VDD1 to 3
DH1
DH2
Option Codes
LCD Duty & Bias
LCD
Frequency
Selection
Power Selection
LCD Drive
Mode
Selection
MOV LCDM, #I
Instruction
LCD
Waveform
VDD
VSS
F
LCD
Figure 12. LCD Driver/Controller Circuit Diagram
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