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參數資料
| 型號： | W742C814 |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 4位微控制器 |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| 中文描述： | 4位單片機的小型通用紅外遙控器 |
| 文件頁數： | 32/46頁 |
| 文件大小： | 704K |
| 代理商： | W742C814 |
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W742C814
- 32 -
6.21 LCD Controller/Driver
The W742C814 can directly drive an LCD with 32 segment output pins and 4 common output pins for
a total of 32
×
4 dots. The LCD driving mode is 1/3 bias 1/4 duty. The alternating frequency of the LCD
can be set as Fslow/64, Fslow/128, Fslow/256, or Fslow/512. The structure of the LCD alternating
frequency (F
LCD
) is shown in the Figure 6-15.
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
Q9
Fslow
Selector
Fw/512
Fw/256
Fw/128
Fw/64
F
LCD
Figure 6-15 LCD alternating frequency (FLCD) circuit diagram
Fslow = 32.768 KHz, the LCD frequency is as shown in the table below.
Table 6. The relationship between the FLCD and the duty cycle
LCD frequency
Fslow/64
(512Hz)
Fslow/128
(256Hz)
Fslow/256
(128Hz)
Fslow/512
(64Hz)
1/4 duty
128 Hz
64 Hz
32 Hz
16 Hz
Corresponding to the 32 LCD drive output pins, there are 32 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 segment32 pins by a direct memory access. The relation between
the LCD data RAM and segment/common pins is shown below.
Table 7. The reation between the LCDR and segment/common pins used as LCD drive output
pins
LCD DATA RAM
OUTPUT PIN
LCDR00
SEG0
LCDR01
SEG1
:
:
:
LCDR1E
SEG30
LCDR1F
SEG31
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
:
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相關代理商/技術參數 |
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