p89lpc9402 NXP Semiconductors, p89lpc9402 Datasheet - Page 38

• Manufacturer Part Number: p89lpc9402
• Description: 8-bit Microcontroller With Accelerated Two-clock 80c51 Core 8 Kb 3 V Byte-erasable ?ash With 32 Segment 4 Lcd Driver
• Manufacturer: NXP Semiconductors

NXP Semiconductors
Table 8.
P89LPC9402_1
Product data sheet
Number of
Backplanes
4
3
2
1
Selection of display configurations
7.27.4.1 Internal clock
7.27.1 General description
7.27.2 Functional description
7.27.3 LCD bias voltages
7.27.4 Oscillator
7.27 LCD driver
Segments
128
96
64
32
The LCD segment driver in the P89LPC9402 can interface to most LCDs using low
multiplex rates. It generates the drive signals for static or multiplexed LCDs containing up
to four backplanes and up to 32 segments. The LCD controller communicates to a host
using the I
LCD driver are available on the P89LPC9402 providing system flexibility. Communication
overhead to manage the display is minimized by an on-chip display RAM with
auto-increment addressing, hardware subaddressing, and display memory switching
(static and duplex drive modes).
The LCD controller is a versatile peripheral device designed to interface microcontrollers
to a wide variety of LCDs. It can directly drive any static or multiplexed LCD containing up
to four backplanes and up to 32 segments. The display configurations possible with the
LCD controller depend on the number of active backplane outputs required. A selection of
display configurations is shown in
in a typical system.
The microcontroller communicates to the LCD controller using the I
appropriate biasing voltages for the multiplexed LCD waveforms are generated internally.
The only other connections required to complete the system are to the power supplies
(V
LCD biasing voltages are obtained from an internal voltage divider consisting of three
series resistors connected between V
compensated externally via the supply to pin V
multiplexing of the LCD based on programmable configurations.
An internal oscillator provides the clock signals for the internal logic of the LCD controller
and its LCD drive signals. After power-up, pin SDA must be HIGH to guarantee that the
clock starts.
DD
, V
SS
7-segments numeric
Digits
16
12
8
4
2
and V
C-bus. The I
LCD
) and the LCD panel chosen for the application.
Rev. 01 — 22 April 2009
2
C-bus clock and data signals for both the microcontroller and the
8-bit microcontroller with accelerated two-clock 80C51 core
Indicator
symbols
16
12
8
4
Table
LCD
8. All of these configurations can be implemented
and V
14- segments alphanumeric
Characters
8
6
4
2
LCD
SS
. The LCD voltage can be temperature
. A voltage selector drives the
Indicator
symbols
16
12
8
4
P89LPC9402
2
C-bus.The
© NXP B.V. 2009. All rights reserved.
Dot matrix
128
96
64
32
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