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參數(shù)資料
| 型號(hào)： | W742S81A |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| 中文描述： | 4-BIT, FLASH, 3.58 MHz, MICROCONTROLLER, PQFP100 |
| 文件頁數(shù)： | 33/47頁 |
| 文件大小： | 242K |
| 代理商： | W742S81A |
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W742S81A
Publication Release Date: March 2003
- 33 -
Revision A1
operand
6.22 LCD Controller/Driver
The W742S81A can directly drive an LCD with 40 segment output pins and 4 common output pins for a
total of 40
×
4 dots. The LCD driving mode is 1/3 bias 1/4 duty. 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 6-14.
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
Q9
Fw
Selector
Fw/512
Fw/256
Fw/128
Fw/64
Fs or Fosc/128
(By Dual or single
clock Option)
F
LCD
Figure 6-14 LCD alternating frequency (FLCD) circuit diagram
Fw = 32.768 KHz, the LCD frequency is as shown in the table below.
LCD frequency
Fw/64 (512Hz)
Fw/128 (256Hz)
Fw/256 (128Hz)
Fw/512 (64Hz)
1/4 duty
128 Hz
64 Hz
32 Hz
16 Hz
Table 6 The relationship between the FLCD and the duty cycle
Corresponding to the 40 LCD drive output pins, there are 40 LCD data RAM segments. Instructions such
as MOV LPL,R, MOV LPH,R, MOV @LP,R, and MOV R,@LP are used to control the LCD data RAM.
The data in the LCD data RAM are transferred to the segment output pins automatically without program
control. When the bit value of the LCD data RAM is "1," the LCD is turned on. When the bit value of the
LCD data RAM is "0," LCD is turned off. The contents of the LCD data RAM (LCDR) are sent out
through the segment0 to segment39 pins by a direct memory access. The relation between the LCD data
RAM and segment/common pins is shown below.
COM3
BIT 3
0/1
0/1
:
0/1
0/1
COM2
BIT 2
0/1
0/1
:
0/1
0/1
COM1
BIT 1
0/1
0/1
:
0/1
0/1
COM0
BIT 0
0/1
0/1
:
0/1
0/1
LCD DATA RAM
LCDR00
LCDR01
:
LCDR26
LCDR27
OUTPUT PIN
SEG0
SEG1
:
SEG38
SEG39
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| W742S82A | 4-BIT TELEPHONE CONTROLLER |
| W74IE20X | 4-BIT FLASH MICROCONTROLLER |
| W741E202 | 4-BIT FLASH MICROCONTROLLER |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| W742S82A | 制造商:WINBOND 制造商全稱:Winbond 功能描述:4-BIT TELEPHONE CONTROLLER |
| W7-48D12 | 制造商:INTRONICS 制造商全稱:INTRONICS 功能描述:DC/DC MODULES |
| W7-48D15 | 制造商:INTRONICS 制造商全稱:INTRONICS 功能描述:DC/DC MODULES |
| W7-48D5 | 制造商:INTRONICS 制造商全稱:INTRONICS 功能描述:DC/DC MODULES |
| W7-48S12 | 制造商:INTRONICS 制造商全稱:INTRONICS 功能描述:DC/DC MODULES |
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