PCF2119VU Просмотр технического описания (PDF) - Philips Electronics

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PCF2119VU

LCD controllers/drivers

Philips Electronics 

Philips Semiconductors

LCD controllers/drivers

Product specification

PCF2119X

8 INSTRUCTIONS

Only two PCF2119x registers, the Instruction Register (IR)

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

the MPU. Before internal operation, control information is

stored temporarily in these registers, to allow interfacing to

various types of MPUs which operate at different speeds

or to allow interface to peripheral control ICs. The

PCF2119x operation is controlled by the instructions

shown in Table 6 together with their execution time.

Details are explained in subsequent sections.

Instructions are of 4 types, those that:

1. Designate PCF2119x functions such as display

format, data length, etc.

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 MPU 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 6.

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

executed.

Table 5 Instruction set for I2C-bus commands

CONTROL BYTE

COMMAND BYTE

I2C-BUS COMMANDS

Co RS 0 0 0 0 0 0 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 note 1

Note

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

2003 Jan 30

22

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