PCF8820 datasheet(19/60 Pages) PHILIPS

19 / 60 page

2000 Dec 07

Philips Semiconductors

Product speciﬁcation

× 101 Grey-scale/ECB colour dot matrix

LCD driver

PCF8820

INSTRUCTIONS

The PCF8820 interfaces via the I2C-bus. The clock of the

LCD is not required to process instructions.

The data received by the PCF8820 is either instruction

data which defines its operating mode or display data to be

stored in its DDRAM. The type of data is identified by

bit RS. When bit RS = 0, the PCF8820 will respond to the

instructions. When bit RS = 1, the PCF8820 will load the

data into its DDRAM.

There are four types of instruction data whose functions

are listed below:

• Define PCF8820 functions, such as display

configuration, etc.

• Set DDRAM addresses

• Perform data transfers to DDRAM

• Other functions.

In normal use, the most frequently used instructions are

those which perform data transfers to the DDRAM.

Address pointer update follows after the data byte has

been written to the DRAM. This reduces the program load

of the microcontroller.

Undefined register locations are not allowed.

The instruction set comprises several command pages.

A command page is selected by setting bits H0 to H2.

The instruction set is given in Table 2.

The bit functions are described in detail in Section 8.1.

Table 2

Instruction set

INSTRUCTION

CONTROL

BITS(1)

COMMAND BYTE

DESCRIPTION

R/W

DB7

DB6

DB5

DB4

DB3

DB2

DB1

DB0

Independent command page (H2 = X, H1 = X, H0 = X); note 2

Write data

writes data to DDRAM

Read

temperature

TR7

TR6

TR5

TR4

TR3

TR2

TR1

TR0

reads sensor temperature

read-out

NOP

000000000

no operation

Default H2 to H0

000000000

jumps to function and RAM

command page

Function and RAM command page (H2 = 0, H1 = 0, H0 =0)

Instruction set

0000001

selects a command page

Select function

000001

data order; power-down

control; address mode

Set Y address of

DDRAM

00010

selects Y-address of

DDRAM: 0

≤ Y ≤ 16

Set X address of

DDRAM

001

selects X-address of

DDRAM: 0

≤ X ≤ 100

Display setting command page (H2 = 0, H1 = 0, H0 =1)

Display control

00000001

selects display mode

External display

control

0000001

mirror X; mirror Y; partial

screen mode

Bias system

0000010

BS2

BS1

BS0

selects bias system

Bias system 1/2

000011100

BS1/2 set bias system 1/2 for partial

screen mode

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