pcf8832 NXP Semiconductors, pcf8832 Datasheet - Page 38

• Manufacturer Part Number: pcf8832
• Description: Pcf8832 Stn Rgb - 384 Output Column Driver
• Manufacturer: NXP Semiconductors

Philips Semiconductors
11 SERIAL INTERFACES
Communication with the microcontroller can also occur via
a clock-synchronized serial peripheral interface. It is
possible to select two different 3-line interfaces (SPI and
serial interface) or a 4-line SPI.
11.1
The SPI is a 3-line or 4-line interface for communication
between the microcontroller and the LCD driver chip. The
three lines are: SCE (chip enable), SCLK (serial clock) and
SDI (serial data). For the 4-line serial interface a separate
D/C line is included.
The PCF8832 is connected to the serial data I/O of the
microcontroller by two pins: SDI (data input) and SDO
(data output) which must be connected together.
2002 Aug 16
handbook, full pagewidth
handbook, full pagewidth
STN RGB - 384 output column driver
Serial peripheral interface
SCE
D/C
SCLK
SDI
SCE
D/C
SCLK
SDI
S
S
b7
b7
b6
b6
b5
b5
Fig.35 Serial bus protocol, write to register.
b4
b4
Fig.36 Serial bus protocol, write to RAM.
control byte
control byte
b3
b3
b2
b2
b1
b1
38
b0
b0
11.1.1
The display data/command indication may be controlled
either via software (3-line SPI) or the D/C select pin
(4-line SPI). When the D/C pin is used, display data is
transmitted when D/C is HIGH and command data is
transmitted when D/C is LOW (see Figs 35 and 36). When
D/C is not used, then the D/C is set via the control byte.
When the 3-line SPI interface is used, the display
data/command is controlled by software (see
Figs 37 and 38).
If SCE is pulled HIGH during a serial display data stream,
the interrupted byte is invalid data but all previously
transmitted data are valid.
b7
b7
b6
b6
W
RITE MODE
b5
b5
register value
display data
b4
b4
b3
b3
b2
b2
b1
b1
Preliminary specification
MGW709
MGW708
b0
b0
PCF8832
P
P