參數(shù)資料
型號： P83C834
廠商： NXP Semiconductors N.V.
英文描述： 8-bit microcontrollers with LCD-driver
中文描述： 8位微控制器與LCD驅(qū)動器
文件頁數(shù)： 18/36頁
文件大?。?/td> 165K
代理商： P83C834
1997 Jul 03
18
Philips Semiconductors
Product specification
8-bit microcontrollers with LCD-driver
P83C434; P83C834
6.7
LCD driver unit
The LCD driver unit has 24 segment drivers, two of which
can also serve as backplane drivers. Selection will be done
automatically, depending on the multiplex ratio as shown
in Table 20.
6.7.1
F
UNCTIONAL DESCRIPTION OF THE
LCD
DRIVER
The P83C434 and P83C834 have a display driver which
interfaces to almost any LCD which has a low multiplex
rate. The interface delivers drive signals for any static or
multiplexed LCD panel that contains up to 4 backplanes
and up to 24 segments. Figure 11 shows the block
diagram of the LCD driver. The following features are
incorporated:
Selection of backplane drive configuration:
– static
– 2, 3 or 4 backplane multiplexing
Selection of display bias configuration:
–
–
24 individual segment drivers can be used to provide:
– up to twelve 7-segment numeric characters
– up to six 14-segment alphanumeric characters
– graphic using up to 88 elements
– twelve 8-bit derivative registers for display data bits.
1
2
internal LCD bias generation
1
3
internal LCD bias generation
The display configurations possible with the P83C434 and
P83C834 depend on the number of active backplane
outputs required.
A selection of display configurations is given in Table 21.
The appropriate biasing voltages for the multiplexed LCD
wave forms are generated internally.
At power-on all the LCD driver control register bits are
cleared. The LCD driver is not affected by executing Idle or
Power-down modes.
6.7.2
LCD
BIAS GENERATION
The LCD operating voltage: V
op
= V
DD(P)
V
SS
.
V
op
should be chosen so that the off voltage (V
off(rms)
) is
just below the threshold voltage (V
th
), typically when the
LCD exhibits 10% contrast. Fractional LCD biasing
voltages are obtained from an internal voltage divider of
three resistors connected between V
SS
and V
DD(P)
. The
centre resistor may be switched out of circuit to provide a
1
2
bias voltage level for a 1 : 2 multiplex configuration.
6.7.3
LCD
VOLTAGE SELECTOR
The LCD voltage selector coordinates the multiplexing of
the LCD according to the selected drive configuration.
The operation of the voltage selector is controlled by the
MODE bits in the LCD control byte.
The biasing configurations that apply to the preferred
mode of operation, together with the biasing
characteristics as functions of V
op
= V
DD(P)
V
SS
and the
resulting discrimination ratios (D), are given in Table 22.
Fig.11 Block diagram of the LCD driver.
handbook, full pagewidth
MGG013
LCD VOLTAGE SELECTOR
SEGMENT
REGISTERS
LCD CONTROL
REGISTER
SEGMENT
BACKPLANE
MUX.
LCD BIAS
GENERATION
LCD DRIVERS
22
24
4
8
internal
bus
CLOCK
VDD(P)
VSS
S0 to S21
S22/BP3 S23/BP2 BP1 BP0
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