參數(shù)資料
型號： GMS87C7216Q
廠商： Electronic Theatre Controls, Inc.
元件分類： 8位微控制器
英文描述： 8-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述： 8位單晶片微控制器
文件頁數(shù)： 71/121頁
文件大?。?/td> 1645K
代理商： GMS87C7216Q
GMS81C7208/7216
FEB. 2005 Ver 1.04
67
18.2 Duty and Bias Selection of LCD Driver
5 kinds of driving methods can be selected by DTY (bits 3 and 2
of LCD Control Register and connection of VCL pin externally.
Figure 18-3 shows typical driving waveforms for LCD.).
Figure 18-3 LCD Drive Waveform (Voltage COM-SEG Pins)
18.3 Selecting Frame Frequency
Frame frequency is set to the main frequency as shown in the fol-
lowing Table 18-1.
The LCK[1:0] of LCR determines the frequency of COM signal
scanning of each segment output. The watch timer must be en-
abled when the LCD display is turned on. RESET clears the LCD
control register LCR values to logic zero. The LCD display can
continue to operate even during the SLEEP and STOP modes.
.
VCL2
VCL1
VCL0
GND
-VCL0
-VCL1
-VCL2
1/f
F
Data “1”
(a) 1/4 duty, 1/3 bias
Data “0”
VCL2
VCL1
VCL0
GND
-VCL0
-VCL1
-VCL2
1/f
F
Data “1”
(b) 1/3 duty, 1/3 bias
Data “0”
1/f
F
Data “1” Data “0”
(c) 1/2 duty,1/3 bias
1/f
F
Data “1”
Data “0”
VCL2
VCL1
VCL0
GND
-VCL0
-VCL1
-VCL2
(e) Static
Note: f
F
: LCD Frame Frequency
1/f
F
Data “1” Data “0”
VCL2
GND
-VCL0 = -VCL1
-VCL2
(d) 1/2 duty, 1/2 bias
VCL1 = VCL0
VCL2
VCL1
VCL0
GND
-VCL0
-VCL1
-VCL2
LCK[1:0]
LCD clock
Frame Frequency (Hz)
(When f
XIN
= 4.19 MHz)
00
01
10
11
f
XIN
÷
2
7
÷
32
f
XIN
÷
2
7
÷
64
f
XIN
÷
2
7
÷
128
f
XIN
÷
2
7
÷
256
1024
512
256
128
Table 18-1 Setting of LCD Frame Frequency
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