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MC141511A bảng dữ liệu(PDF) 7 Page - Motorola, Inc

tên linh kiện MC141511A
Giải thích chi tiết về linh kiện  LCD Segment Driver
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nhà sản xuất  MOTOROLA [Motorola, Inc]
Trang chủ  http://www.freescale.com
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MC141511A
MOTOROLA
VDD AND VSS
The main dc power is supplied to the part by these two connec-
tions. VDD is the most-positive supply level for logic circuitry and VSS is
ground.
VLCD
This supply connection provides the voltage level for the segment
drivers and is connected to the Vout connection of the MC68HC05L10
MCU.
VSEGL, VSEGH
These inputs are connected to V2 and V3 of an external voltage
divider. See Figure 4.
D0 - D7
These connections form an eight bit wide bidirectional data bus
which are connected to D0 through D7 of the MC68HC05L10.
A0 - A9
These inputs form a ten-bit wide address bus for addressing the
display
RAM
and
are
connected
to
A0
through
A9
of
the
MC68HC05L10.
BPSYNC
This input is a periodic active-low signal from the MC68HC05L10
for timing synchronization. BPSYNC is connected to FRM of
MC68HC05L10. See Figure 5.
BPCLK
This input may be run as high as 4.096 kHz (50% duty cycle). It
provides the required frame frequency for the segment driver. It is con-
nected to BPCLK of the MC68HC05L10. Thus, the frequency is usually
2.048 kHz. See Figure 5.
PHI2
This input is a bus clock input that is used for data bus timing syn-
chronization. It is connected to P02 of MC68HC05L10.
SEG0 - SEG127
These 128 output lines provide the frontplane drive signals to the
LCD panel. These outputs are forced to a low level while display is
turned off. Any unused segment outputs should be left open.
CE
This is an active low chip enable input and is connected to either
CS1, CS2, CS3 or CS4 of the MC68HC05L10.
LRS
The left-right selection input defines the direction of the segment
driver display. See Figure 8.
0 or Low = SEG 0 - 127
1 or High = SEG 127 - 0
MS
This input selects how display RAM is addressed. Either a 1:32 or
1:41 multiplex ratio is possible.
0 or Low = 1:32 multiplex addressing
1 or High = 1:41 multiplex addressing
R/W
This input indicates which direction the data is to be passed over
the data bus. When R/W is low, the LCD driver reads data from the data
bus (D0-D7). When R/W is high, the LCD driver writes data to the data
bus (D0-D7). This input is connected to R/W of MC68HC05L10.
TEST
Allowing this connection to float or connecting it to VSS (GND)
places the part in the normal mode of operation. This input has an on-
chip pulldown resistance of approximately 1M.
PIN DESCRIPTIONS
Figure 4. External Voltage Divider
V3
V2


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