PCF8562 datasheet(21/44 Pages) PHILIPS

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PCF8562

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Product data sheet

Rev. 6 — 16 June 2011

21 of 43

NXP Semiconductors

PCF8562

Universal LCD driver for low multiplex rates

• In 1:2 multiplex mode, rows 0 and 1 are selected

• In static mode, row 0 is selected

The PCF8562 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 content of

row 2 to be selected for display instead of the content of row 0. In the 1:2 multiplex mode,

the content 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.

7.10.5 Input bank selector

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

selected LCD drive configuration.

The bank-select command (see Table 14) can be used to load display data in row 2 in

static drive mode or in rows 2 and 3 in 1:2 mode. The input bank selector functions are

independent of the output bank selector.

7.11 Blinking

The display blinking capabilities of the PCF8562 are very versatile. The whole display can

blink at frequencies selected by the blink-select command (see Table 15). The blink

frequencies are fractions of the clock frequency. The ratio between the clock and blink

frequencies depends on the blink mode selected (see Table 8).

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.

[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).

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 11).

Table 8.

Blinking frequencies[1]

Blink mode

Normal operating mode ratio

Nominal blink frequency

off

blinking off

12 Hz

21 Hz

0.5 Hz

clk

768

----------

clk

1536

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

clk

3072

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

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