參數(shù)資料
型號(hào)： MC68HC705CL4FU
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 1.84 MHz, MICROCONTROLLER, PQFP80
封裝： QFP-80
文件頁(yè)數(shù)： 62/101頁(yè)
文件大?。?/td> 517K
代理商： MC68HC705CL4FU
February 12, 1997
GENERAL RELEASE SPECIFICATION
MC68HC05CL4
LCD DRIVER
MOTOROLA
REV 2.0
9-5
9.4
LCD CONTROL REGISTER (LCDCTR)
DISON—Display On
The Display is on when this bit is ’1’ and off when this bit is ’0’. Setting this bit to
’0’ also disconnects the voltage generator resistor chain from VDD, thus reduc-
ing power.
LC, FC
If the quality of the display is not critical, the LCD block on the device can be put
into a low current mode using the FC and LC bits in the LCD register. By select-
ing the appropriate values for each bit, as shown in Table 9-2, an extra resistor
can be added to the divider chain, hence reducing the current consumption.
When normal quality is required for the display, the Fast Charge option should
be used which resumes default resister values for a pre-determined period in
each frame. The default value of these resistors is approximately 30 K
.
MX4
When this bit is set the system operates with 49 frontplanes and 4 backplanes,
when cleared the system operates with 45 frontplanes and 8 backplanes.
CC1 - CC3—Contrast Control
These bits can be used to select the values of the contrast control resistors.
When set to 1 the corresponding resistor will be shorted. On reset these bits
are set to 0.
76543210
LCDCTR1
$000A
READ
CC3
CC2
CC1
MX4
FC
LC
DISON
WRITE
RESET
0
U
0000
U = UNAFFECTED
Table 9-2. Voltage Divider Resistor Options
LC
FC
ACTION
0
Default value of
≈30K
0
1
No Action
1
0
Resistor value
≈30K per resistor selected
11
Fast-Charge, for a period lcdclk/128 in each time
slot the resistor values are reduced to default
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