PCF8576DTSLASHS400SLASH2 datasheet(23/57 Pages) NXP

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PCF8576D

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Product data sheet

Rev. 14 — 10 June 2013

23 of 57

NXP Semiconductors

PCF8576D

Universal LCD driver for low multiplex rates

mode, the contents of rows 2 and 3 may be selected instead of rows 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.

7.10.6 Input bank selector

The input bank selector loads display data into the display RAM in accordance with the

selected LCD drive configuration. Display data can be loaded in row 2 in static drive mode

or in rows 2 and 3 in 1:2 multiplex drive mode by using the bank-select command (see

Table 15). The input bank selector functions independently to the output bank selector.

7.11 Blinking

The display blinking capabilities of the PCF8576D are very versatile. The whole display

can blink at frequencies selected by the blink-select command (see Table 16). The blink

frequencies are derived from the clock frequency. The ratio between the clock and blink

frequencies depends on the blink mode selected (see Table 16).

An additional feature is for an arbitrary selection of LCD elements to blink. This applies to

the static and 1:2 multiplex 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 blink frequency. This mode can

also be specified by the blink-select command.

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

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

intervals.

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

can be effectively performed by resetting and setting the display enable bit E at the

required rate using the mode-set command (see Table 12).

[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 12).

Table 9.

Blinking frequencies

Blink mode

Normal operating mode ratio

Nominal blink frequency[1]

off

blinking off

12 Hz

21 Hz

0.5 Hz

clk

768

----------

clk

1536

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

clk

3072

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