參數(shù)資料
型號： GMS87C7216LQ
廠商： Electronic Theatre Controls, Inc.
元件分類： 數(shù)學處理器
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)： 72/121頁
文件大?。?/td> 1645K
代理商： GMS87C7216LQ
GMS81C7208/7216
68
FEB. 2005 Ver 1.04
LCD Port Selection
Segment pins are also used for normal I/O pins. The LCD port se-
lection register LPMR is used to set R
n
pin for ordinary digital in-
put. Refer to LPMR register as shown in Figure 18-2.
Bias Resistor
To operate LCD, built-in Bias resistor dividing V
DD
to V
SS
section into several stages generates necessary voltage.
The BTC (Bit 6 of LCR) switches Transistor supplying voltage to
serially connected Bias resistor. If it is ‘1’, it turns on, and if it is
‘0’, it turns off. The LCD drive voltage (V
CL2
) is given by the dif-
ference in potential (V
DD
-V
CL2
) between pins V
DD
and V
CL2
.
Therefore, when the MCU operating voltage is 5V and LCD drive
voltage are the same, the Bias pin is connected to the V
CL2
pin as
shown in (a) of Figure 18-5.
Figure 18-4 Application Example of 5V LCD Panel
When require supply 3V output to the LCD, the voltage of V
CL2
becomes 3V as shown in Figure 18-5. Because V
DD
is down to
3V through internal 2R resistor.
The LCD light only when the difference in potential between the
segment and common output is ±VCL, and turn off at all other
times. During reset, the power switch of the LCD driver is turned
off automatically, shutting off the VCL voltage.
one frame
(at 1/4 duty, 1/3 bias)
COM0 pin
VCL1
VCL2
BIAS
BTC
V
DD
V
SS
(a) Internal, Static or 1/3 Bias
BTC = “1”
BRC = “1”
I
MCU Internal
VCL0
BRC
2R
R
R
R
BTC
V
DD
V
SS
(b) Internal, Static or 1/2 Bias
BTC = “1”
BRC = “1”
Two pins are connected
each other
I
MCU Internal
BRC
2R
R
R
R
Typ. R=65k
VCL1
VCL2
BIAS
VCL0
Short two pins
each other externally
VCL2=5V
VCL1=3.33V
VCL0=1.67V
VCL2=5V
VCL1=2.5V
VCL0=2.5V
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