PCF8576CUSLASH5 datasheet(18/44 Pages) PHILIPS

18 / 44 page

1998 Jul 30

Philips Semiconductors

Product speciﬁcation

Universal LCD driver for low multiplex

rates

PCF8576C

6.16

Blinker

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.

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

Off

−−

blinking off

2Hz

1Hz

0.5 Hz

clk

92160

----------------

clk

15360

----------------

clk

184320

--------------------

clk

30720

----------------

clk

368640

--------------------

clk

61440

----------------

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