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PCD8544 Schematic ( PDF Datasheet ) - NXP Semiconductors

Teilenummer PCD8544
Beschreibung 48 x 84 pixels matrix LCD controller/driver
Hersteller NXP Semiconductors
Logo NXP Semiconductors Logo 




Gesamt 32 Seiten
PCD8544 Datasheet, Funktion
INTEGRATED CIRCUITS
DATA SHEET
PCD8544
48 × 84 pixels matrix LCD
controller/driver
Product specification
File under Integrated Circuits, IC17
1999 Apr 12






PCD8544 Datasheet, Funktion
Philips Semiconductors
48 × 84 pixels matrix LCD controller/driver
Product specification
PCD8544
7 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
(6 × 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.
1999 Apr 12
6

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PCD8544 pdf, datenblatt
Philips Semiconductors
48 × 84 pixels matrix LCD controller/driver
Product specification
PCD8544
handboSokC, fEull pagewidth
D/C
SCLK
SDIN
DB7
DB6 DB5 DB4 DB3 DB2
DB1
DB0
MGL630
Fig.10 Serial bus protocol - transmission of one byte.
handboSoCk,Efull pagewidth
D/C
SCLK
SDIN
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 DB7 DB6 DB5
MGL631
1999 Apr 12
Fig.11 Serial bus protocol - transmission of several bytes.
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