PCF8813 datasheet(7/72 Pages) PHILIPS

7 / 72 page

2004 Mar 05

Philips Semiconductors

Product speciﬁcation

(67 + 1)

× 102 pixels matrix LCD driver

PCF8813

FUNCTIONAL DESCRIPTION

7.1

I/O buffer and interface

One of five industrial standard interfaces can be selected

using the interface configuration inputs PS2, PS1 and

PS0.

Table 1

Parallel/serial/I2C-bus interface selection

7.2

Oscillator

The on-chip oscillator provides the clock signal for the

display system. No external components are required.

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

7.3

Address counter

The Address Counter (AC) assigns addresses to the

display data RAM for writing. The X address X[6:0] and the

Y address Y[3:0] are set separately.

7.4

Display data RAM

The PCF8813 contains a 68

× 102 bit static RAM which

stores the display data. The Display Data RAM (DDRAM)

is divided into eight banks of 102 bytes (8

× 8 × 102 bits),

one bank of 1

× 3 × 102 bits and a separate bank of

× 1 × 102 for icons. During RAM access, data is

transferred to the RAM via any of the four interfaces. There

is a direct correspondence between the X address and the

column output number.

7.5

Timing generator

The timing generator produces the various signals

required to drive the internal circuitry. Internal chip

operation is not affected by operations on the data buses.

7.6

Display address counter

The display is generated by continuously shifting rows of

RAM data to the dot matrix LCD via the column outputs.

The display status (all dots on/off and normal/inverse

video) is set by bits D and E in the display control

command.

7.7

LCD row and column drivers

The PCF8813 contains 68 row and 102 column drivers,

which connect the appropriate LCD bias voltages in a

sequence to the display in accordance with the data that is

to be displayed. Figure 2 shows typical waveforms.

Unused outputs should be left unconnected.

PS2

PS1

PS0

INTERFACE

3-line SPI

4-line SPI

8080 parallel interface

6800 parallel interface

100

high-speed I2C-bus interface

110

101

3-line serial interface

111

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