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參數資料
型號: W741C250
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, PQFP64
封裝: 14 X 20 MM, QFP-64
文件頁數: 23/88頁
文件大小: 496K
代理商: W741C250
W741C250
Publication Release Date: March 1998
- 23 -
Revision A4
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
MOV LCDM, #I
Instruction
LCD
Waveform
V
V
F
LCD
DD
SS
DD1 to 3
Figure 12. LCD Driver/Controller Circuit Diagram
When Fw = 32.768 KHz, the LCD frequency is as shown in the table below.
LCD FREQUENCY
Fw/512 (64 Hz)
Fw/256 (128 Hz)
Fw/128 (256 Hz)
Fw/64 (512 Hz)
Corresponding to the 24 LCD drive output pins, there are 24 LCD data RAM segments (LCDR00 to
LCDR17). Instructions such as MOV LCDR, #I; MOV WR, LCDR; MOV LCDR, WR; and MOV LCDR,
ACC 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," the LCD is turned off.
The contents of the LCD data RAM (LCDR) are sent out through the segment 0 to segment 23 pins by
a direct memory access. The relationship between the LCD data RAM and segment/common pins is
shown below.
STATIC
64
128
256
512
1/2 DUTY
32
64
128
256
1/3 DUTY
21
43
85
171
1/4 DUTY
16
32
64
128
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
Output pin
SEG0
SEG1
.
.
.
.
.
.
LCDR16
LCDR17
SEG22
SEG23
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