PCF8813 datasheet(28/72 Pages) PHILIPS

28 / 72 page

2004 Mar 05

Philips Semiconductors

Product speciﬁcation

(67 + 1)

× 102 pixels matrix LCD driver

PCF8813

11 INSTRUCTIONS

The PCF8813 interfaces via the 8-bit parallel interface, two

different 3-line serial interfaces, 4-wire serial interface or

an I2C-bus interface. Processing of the instructions does

not require the display clock.

In the case of the parallel and 4-wire serial interface, data

accesses to the PCF8813 can be divided into two areas;

those that define the operating mode of the device, and

those that fill the display RAM; the distinction being the

D/C input. When the D/C input is set to logic 0, the chip will

respond to instructions as defined in Table 5. When the

D/C bit is at logic 1, the chip will send data into the RAM.

When the 3-wire serial interface or the I2C-bus interface is

used, the distinction between instructions that define the

operating mode of the device and those that fill the display

RAM is made respectively by the display data length

instruction (4-line SPI) or by D/C bit in the data stream

(3-line serial interface and I2C-bus interface).

There are four types of instructions:

• Defining PCF8813 functions such as display

configuration, etc.

• Setting internal RAM addresses

• Performing data transfer with internal RAM

• Other instructions.

In normal use, category 3 instructions are used most

frequently. To lessen the MPU program load, automatic

incrementing by one of the internal RAM address pointers

after each data write is implemented.

Table 5

Instruction set

Instructions not expressly deﬁned in this table and reserved instructions are not allowed in PCF8813 applications.

INSTRUCTION

D/CR/W

COMMAND BYTE

DESCRIPTION

DB7

(MSB)

DB6

DB5

DB4

DB3

DB2

DB1

DB0

(LSB)

H=0or1

NOP

000000

no operation

Function set

Power-down

control; entry

mode

Read status byte

00110

δ(1)

read status byte

for serial and

I2C-bus interfaces

Read status byte

BUSY

DON

RES

MF2

MF1

MF0

DS1

DS0

reads parallel

interface status

byte

Write data

writes data to

RAM

H=0

Reserved

00001

do not use

Display control

sets display

conﬁguration

Set lower/higher

program range

001000

PRS

VLCD programming

range

Set power control

HVgen on/off

001001

switch HVgen

on/off

Display conﬁguration

001011

δ(1)

double command

byte: set data

order; top/bottom

row swap mode

0000

BRS

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