PCF8811USLASH2DASLASH1 datasheet(8/73 Pages) PHILIPS

8 / 73 page

2004 May 17

Philips Semiconductors

Product speciﬁcation

× 128 pixels matrix LCD driver

PCF8811

7.20

OSC: oscillator

When the on-chip oscillator is used this input must be

connected to VDD1. An external clock signal, if used, is

connected to this input. If the oscillator and external clock

are both inhibited by connecting the OSC pin to VSS1, the

display is not clocked and may be left in a DC state. To

avoid this the chip should always be put into Power-down

mode before stopping the clock.

7.21

RES: reset

This signal will reset the device and must be applied to

properly initialize the chip. The signal is active LOW.

BLOCK DIAGRAM FUNCTIONS

8.1

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 VDD1. An external

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

8.2

Address Counter (AC)

The address counter 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.

8.3

Display Data RAM (DDRAM)

The PCF8811 contains an 80

× 128-bit static RAM which

stores the display data. The RAM is divided into 10 banks

of 128 bytes (10

× 8 × 128 bits). The icon row when

enabled is always ROW 79 and therefore located in

bank 9. During RAM access, data is transferred to the

RAM via the parallel, serial interface or I2C-bus interface.

There is a direct correspondence between the X address

and the column output number.

8.4

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 bus.

8.5

Display address counter

The display is generated by simultaneously reading out

the RAM content for 2, 4 or 8 rows depending on the

selected current display size. This content will be

processed with the corresponding set of 2, 4 or 8

orthogonal functions and so generating the signals for

switching the pixels in the display on or off according to the

RAM content. The possibility exists to set the p value for

the display sizes 64 and 80 manually to p = 4.

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

video) is set by the bits DON, DAL and E in the command

display control; see Table 6.

8.6

LCD row and column drivers

The PCF8811 contains 80 row and 128 column drivers,

which connect the appropriate LCD bias voltages in

sequence to the display in accordance with the data to be

displayed.

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