PCF2113X datasheet(23/72 Pages) PHILIPS

23 / 72 page

2001 Dec 19

Philips Semiconductors

Product speciﬁcation

LCD controllers/drivers

PCF2113x

INSTRUCTIONS

Only two PCF2113x registers, the Instruction Register (IR)

and the Data Register (DR) can be directly controlled by

the microcontroller. Before internal operation, control

information is stored temporarily in these registers, to

allow interfacing to various types of microcontrollers which

operate at different speeds or to allow interface to

peripheral control ICs.

The instruction set for I2C-bus commands is given in

Table 4.

The PCF2113x operation is controlled by the instructions

shown in Table 5 together with their execution time.

Details are explained in subsequent sections.

Instructions are of 4 types, those that:

1. Designate PCF2113x functions such as display

format, data length, etcetera.

2. Set internal RAM addresses

3. Perform data transfer with internal RAM

4. Others.

In normal use, category 3 instructions are used most

frequently. However, automatic incrementing by 1

(or decrementing by 1) of internal RAM addresses after

each data write lessens the microcontroller program load.

The display shift in particular can be performed

concurrently with display data write, enabling the designer

to develop systems in minimum time with maximum

programming efficiency.

During internal operation, no instructions other than the

‘read busy flag’ and ‘read address’ instructions will be

executed. Because the busy flag is set to a logic 1 while an

instruction is being executed, check to ensure it is a logic 0

before sending the next instruction or wait for the

maximum instruction execution time, as given in Table 5.

An instruction sent while the busy flag is logic 1 will not be

executed.

Table 4

Instruction set for I2C-bus commands

Note

1. R/W is set together with the slave address.

CONTROL BYTE

COMMAND BYTE

I2C-BUS COMMANDS

RS 000000DB7

DB6

DB5

DB4

DB3

DB2

DB1

DB0

note 1

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