pcf8813 NXP Semiconductors, pcf8813 Datasheet - Page 7

• Manufacturer Part Number: pcf8813
• Description: 67 + 1 X 102 Pixels Matrix Lcd Driver
• Manufacturer: NXP Semiconductors

Philips Semiconductors
7
7.1
One of five industrial standard interfaces can be selected
using the interface configuration inputs PS2, PS1 and
PS0.
Table 1 Parallel/serial/I
7.2
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
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
The PCF8813 contains a 68
stores the display data. The Display Data RAM (DDRAM)
is divided into eight banks of 102 bytes (8
one bank of 1
1
transferred to the RAM via any of the four interfaces. There
is a direct correspondence between the X address and the
column output number.
2004 Mar 05
PS2
(67 + 1)
0
0
0
0
1
1
1
1
1
FUNCTIONAL DESCRIPTION
I/O buffer and interface
Oscillator
Address counter
Display data RAM
102 for icons. During RAM access, data is
PS1
0
0
1
1
0
1
0
1
3
PS0
102 pixels matrix LCD driver
0
1
0
1
0
0
1
1
102 bits and a separate bank of
3-line SPI
4-line SPI
8080 parallel interface
6800 parallel interface
high-speed I
3-line serial interface
2
C-bus interface selection
102 bit static RAM which
INTERFACE
2
C-bus interface
8
102 bits),
7
7.5
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
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
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.
Timing generator
Display address counter
LCD row and column drivers
Product specification
PCF8813