PCD8544 datasheet(6/32 Pages) PHILIPS

6 / 32 page

1999 Apr 12

Philips Semiconductors

Product speciﬁcation

× 84 pixels matrix LCD controller/driver

PCD8544

FUNCTIONAL DESCRIPTION

7.1

Oscillator

The on-chip oscillator provides the clock signal for the

display system. No external components are required and

the OSC input must be connected to VDD. An external

clock signal, if used, is connected to this input.

7.2

Address Counter (AC)

The address counter assigns addresses to the display

data RAM for writing. The X-address X6 to X0 and the

Y-address Y2 to Y0 are set separately. After a write

operation, the address counter is automatically

incremented by 1, according to the V flag.

7.3

Display Data RAM (DDRAM)

The DDRAM is a 48

× 84 bit static RAM which stores the

display data. The RAM is divided into six banks of 84 bytes

× 8 × 84 bits). During RAM access, data is transferred

to the RAM through the serial interface. There is a direct

correspondence between the X-address and the column

output number.

7.4

Timing generator

The timing generator produces the various signals

required to drive the internal circuits. Internal chip

operation is not affected by operations on the data buses.

7.5

Display address counter

The display is generated by continuously shifting rows of

RAM data to the dot matrix LCD through the column

outputs. The display status (all dots on/off and

normal/inverse video) is set by bits E and D in the ‘display

control’ command.

7.6

LCD row and column drivers

The PCD8544 contains 48 row and 84 column drivers,

which connect the appropriate LCD bias voltages in

sequence to the display in accordance with the data to be

displayed. Figure 2 shows typical waveforms. Unused

outputs should be left unconnected.

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