參數(shù)資料
型號： 933865300118
廠商： NXP SEMICONDUCTORS
元件分類： 顯示驅(qū)動器
英文描述： LIQUID CRYSTAL DISPLAY DRIVER, PDSO40
封裝： PLASTIC, SOT-158-1, VSOP-40
文件頁數(shù)： 8/40頁
文件大?。?/td> 243K
代理商： 933865300118
1998 May 04
16
Philips Semiconductors
Product specication
Universal LCD driver for low multiplex
rates
PCF8566
6.16
Output bank selector
This selects one of the four bits per display RAM address
for transfer to the display latch. The actual bit chosen
depends on the particular LCD drive mode in operation
and on the instant in the multiplex sequence. In 1 : 4
multiplex, all RAM addresses of bit 0 are the first to be
selected, these are followed by the contents of bit 1, bit 2
and then bit 3. Similarly in 1 : 3 multiplex, bits 0, 1 and 2
are selected sequentially. In 1 : 2 multiplex, bits 0 then 1
are selected and, in the static mode, bit 0 is selected.
The PCF8566 includes a RAM bank switching feature in
the static and 1 : 2 multiplex drive modes. In the static
drive mode, the BANK SELECT command may request
the contents of bit 2 to be selected for display instead of
bit 0 contents. In the 1 : 2 drive mode, the contents of
bits 2 and 3 may be selected instead of bits 0 and 1.
This gives the provision for preparing display information
in an alternative bank and to be able to switch to it once it
is assembled.
6.17
Input bank selector
The input bank selector loads display data into the display
RAM according to the selected LCD drive configuration.
Display data can be loaded in bit 2 in static drive mode or
in bits2and3in1:2 drive mode by using the BANK
SELECT command. The input bank selector functions
independently of the output bank selector.
6.18
Blinker
The display blinking capabilities of the PCF8566 are very
versatile. The whole display can be blinked at frequencies
selected by the BLINK command. The blinking frequencies
are integer multiples of the clock frequency; the ratios
between the clock and blinking frequencies depend on the
mode in which the device is operating, as shown in
Table 4.
An additional feature is for an arbitrary selection of LCD
segments to be blinked. This applies to the static and 1 : 2
LCD drive modes and can be implemented without any
communication overheads. By means of the output bank
selector, the displayed RAM banks are exchanged with
alternate RAM banks at the blinking frequency. This mode
can also be specified by the BLINK command.
In the 1 : 3 and 1 : 4 multiplex modes, where no alternate
RAM bank is available, groups of LCD segments can be
blinked by selectively changing the display RAM data at
fixed time intervals.
If the entire display is to be blinked at a frequency other
than the nominal blinking frequency, this can be effectively
performed by resetting and setting the display enable bit E
at the required rate using the MODE SET command.
Table 4
Blinking frequencies
BLINKING MODE
NORMAL OPERATING
MODE RATIO
POWER-SAVING
MODE RATIO
NOMINAL BLINKING FREQUENCY
fblink (Hz)
Off
blinking off
2Hz
fCLK/92160
fCLK/15360
2
1Hz
fCLK/184320
fCLK/30720
1
0.5 Hz
fCLK/368640
fCLK/61440
0.5
相關(guān)PDF資料
PDF描述
933865310112 LIQUID CRYSTAL DISPLAY DRIVER, PDIP40
935263625026 LIQUID CRYSTAL DISPLAY DRIVER, U
0561168228 PHOSPHOR BRONZE, TIN (40) FINISH, WIRE TERMINAL
933876860602 F/FAST SERIES, POSITIVE EDGE TRIGGERED D FLIP-FLOP, TRUE OUTPUT, PDIP16
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