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)： 74/121頁
文件大?。?/td> 1645K
代理商： GMS87C7216Q
GMS81C7208/7216
70
FEB. 2005 Ver 1.04
18.4 LCD Display Memory
Display data are stored to the display data area (address
100
H
-11A
H
) in the data memory.
The display data stored to the display data area are read au-
tomatically and sent to the LCD driver by the hardware.
The LCD driver generates the segment signals and com-
mon signals in accordance with the display data and drive
method.
Figure 18-7
LCD Display Memory
Therefore, display patterns can be changed by only over-
writing the contents of the display data area with a pro-
gram. The table look up instruction is mainly used for this
overwriting.
Figure 18-7 shows the correspondence between the display
data area and the SEG/COM pins. The LCD lights when
the display data is “1” and turn off when “0”.
The number of segment which can be driven differs de-
pending on the LCD drive method, therefore, the number
of display data area bits used to store the data also differs
(Refer to Figure 18-2). Consequently, data memory not
SEG0
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
C
C
C
C
SEG8
SEG9
SEG10
SEG11
SEG16
SEG17
SEG18
SEG19
SEG20
SEG24
SEG25
SEG26
0
1
2
3
4
5
6
7
Bit
100
H
101
H
102
H
103
H
104
H
105
H
106
H
107
H
108
H
109
H
10A
H
10B
H
10C
H
10D
H
10E
H
10F
H
110
H
111
H
112
H
113
H
114
H
115
H
116
H
117
H
118
H
119
H
11A
H
Note:
The bit 4 to 7 of every byte are
reserved. Any read or write is not
effect.
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Drive Methods
Bit 3
Bit 2
Bit 1
Bit 0
1/4 Duty
COM3
COM2
COM1
COM0
1/3 Duty
-
COM2
COM1
COM0
1/2 Duty
-
-
COM1
COM0
Static
-
-
-
COM0
Table 18-2 The Duty vs. COM Port Configuration
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