PCF8576DHSLASH2 datasheet(21/52 Pages) NXP

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PCF8576D_7

Product data sheet

Rev. 7 — 18 December 2008

21 of 52

NXP Semiconductors

PCF8576D

Universal LCD driver for low multiplex rates

The hardware subaddress must not be changed while the device is being accessed on the

I2C-bus interface.

7.15 Blinker

The PCF8576D has a very versatile display blinking capability. The whole display can

blink at a frequency selected by the blink-select command (see Section 7.17). Each blink

frequency is a fraction of the clock frequency; the ratio between the clock frequency and

blink frequency depends on the blink mode selected (see Table 6).

An additional feature allows an arbitrary selection of LCD segments to blink in the static

and 1:2 drive modes. This is implemented without any communication overheads by the

output bank selector which alternates the displayed data between the data in the display

RAM bank and the data in an alternative RAM bank at the blink frequency. This mode can

also be implemented by the blink-select command (see Section 7.17).

In the 1:3 and 1:4 drive modes, where no alternative RAM bank is available, groups of

LCD segments can blink selectively by changing the display RAM data at ﬁxed time

intervals.

The entire display can blink at a frequency other than the nominal blink frequency by

sequentially resetting and setting the display enable bit E at the required rate using the

mode-set command (see Section 7.17).

[1]

Blink modes 1, 2 and 3 and the nominal blink frequencies 0.5 Hz, 1 Hz and 2 Hz correspond to an oscillator

frequency (fclk) of 1536 Hz (see Section 11).

Table 6.

Blinking frequencies[1]

Blink mode

Normal operating mode ratio

Nominal blink frequency

off

blinking off

2 Hz

1 Hz

0.5 Hz

clk

768

----------

clk

1536

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

clk

3072

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

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