pcf8833 NXP Semiconductors, pcf8833 Datasheet - Page 70
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pcf8833
Manufacturer Part Number
pcf8833
Description
Stn Rgb - 132 X 132 X 3 Driver
Manufacturer
NXP Semiconductors
Datasheet
1.PCF8833.pdf
(112 pages)
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Philips Semiconductors
9
Communication with the microcontroller can also occur via
a clock-synchronized serial peripheral interface. The
selection of this interface is achieved with pin PS0; see
Section 7.1.1.
The serial interface is a 3-line bidirectional interface for
communication between the microcontroller and the LCD
driver chip. The 3 lines are chip enable (SCE), Serial
Clock (SCLK) and Serial Data (SD). The PCF8833 is
connected to the SD pin of the microcontroller by two pins
SDIN (data input) and SDOUT (data output) which are
connected together.
9.1
The Write mode of the interface means that the
microcontroller writes commands and data to the
PCF8833. Each data packet contains a control bit D/C and
a transmission byte. If bit D/C is logic 0, the following byte
is interpreted as a command byte. The command set is
given in Table 1. If bit D/C is logic 1, the following bytes are
stored in the display data RAM or registers. After every
RAM data byte the address counter increments
automatically. Figure 42 shows the general format of the
Write mode and the definition of the transmission byte.
2003 Feb 14
handbook, full pagewidth
STN RGB - 132
SERIAL INTERFACE
Write mode
D/C
D/C
MSB
D7
may be a command OR a data byte
D6
132
transmission byte (TB)
TB
D5
D4
3 driver
Fig.42 Serial data stream, Write mode.
D3
D/C
D2
D1
LSB
D0
70
TB
Any instruction can be sent in any order to the PCF8833;
the MSB is transmitted first. The serial interface is
initialized when SCE is HIGH. In this state, SCLK pulses
have no effect and no power is consumed by the serial
interface. A falling edge on pin SCE enables the serial
interface and indicates the start of data transmission.
Figure 42 shows the protocol of the Write mode:
When SCE is HIGH, SCLKs are ignored. The serial
interface is initialized during the HIGH time of SCE.
At the falling edge of SCE SCLK must be LOW (see
Fig.51)
SDIN is sampled at the rising edge of SCLK
D/C indicates, whether the byte is a command (D/C = 0)
or data (D/C = 1). It is sampled with the first rising SCLK
edge.
If SCE stays LOW after the last bit of a data/command
byte, the serial interface will receive the D/C bit of the
next byte at the next rising edge of SCLK (see Fig.43).
A reset pulse at pin RES interrupts the transmission.
The data being written into the RAM may be corrupted.
The registers are cleared. If SCE is LOW after the rising
edge of RES, the serial interface is ready to receive the
D/C bit of a data/command byte; see Figs 44 and 50.
D/C
TB
Objective specification
MGU958
PCF8833
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