PCF88331 datasheet(67/112 Pages) PHILIPS

67 / 112 page

2003 Feb 14

Philips Semiconductors

Objective speciﬁcation

STN RGB - 132

× 132 × 3 driver

PCF8833

handbook, full pagewidth

MGU953

−

BIAS

LEVEL

GENERATION

MONITOR

CVDD2

VOLTAGE

MULTIPLIER 1

VOLTAGE

MULTIPLIER 2

VLCDIN1

CVLCD1

CVLCD2

VLCD

V2H

V1H

V1L

V2L

VDD1

VSS1

CVDD1

VSS

VLCDIN2

VLCDSENSE

VLCDOUT1

VLCDOUT2

VSS1

VDD3

−

VDD2

VSS2

Fig.37 LCD voltage and bias level generator.

7.9

Column drivers, data processing and data

latches

The column drivers section includes 132

× 3 column

outputs (C0 to C395) which should be connected directly

to the LCD. When less than 396 columns are required, the

unused column outputs must be left open-circuit.

The column output signals are generated in the data

processing block by reading out data from the display RAM

and processing with the appropriate orthogonal function

which represents the simultaneously selected rows.

7.10

Row drivers

The row drivers section includes 132 row outputs which

should be connected directly to the LCD. When less than

132 rows are required the unused column outputs must be

left open-circuit.

When the PCF8833 is operating in full Display mode,

4 rows are always selected simultaneously. In partial

Display mode the active row output signals are selected

one after the other.

PARALLEL INTERFACE

The 8080-series 8-bit bidirectional interface can be used

for communication between the microcontroller and the

PCF8833. The selection of this interfaces is done with pins

PS2, PS1 and PS0; see Section 7.1.1.

The interface functions of the 8080-series parallel

interface are given in Table 86.

Table 86 8080-series parallel interface function; note 1.

Note

1. R = rising edge.

D/C

OPERATION

command write

command data write

display data write

read status register

none

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