PCF8576C Philips Semiconductors, PCF8576C Datasheet - Page 18

• Manufacturer Part Number: PCF8576C
• Description: Universal LCD driver for low multiplex rates
• Manufacturer: Philips Semiconductors

Philips Semiconductors
6.16
The display blinking capabilities of the PCF8576C 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.
Table 4 Blinking frequencies
1998 Jul 30
Universal LCD driver for low multiplex
rates
BLINKING MODE
Blinker
0.5 Hz
2 Hz
1 Hz
Off
NORMAL OPERATING
MODE RATIO
------------------- -
184320
------------------- -
368640
--------------- -
92160
f
f
f
clk
clk
clk
18
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.
POWER-SAVING MODE
RATIO
--------------- -
15360
--------------- -
30720
--------------- -
61440
f
f
f
clk
clk
clk
NOMINAL BLINKING
FREQUENCY
Product specification
blinking off
PCF8576C
0.5 Hz
2 Hz
1 Hz