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PCF2119VU/2/F2

LCD controllers/drivers

NXP Semiconductors. 

NXP Semiconductors

PCF2119x

LCD controllers/drivers

10. Registers

The PCF2119x has two 8-bit registers, an instruction register and a data register. Only

these two registers can be directly controlled by the microcontroller. Before an internal

operation, the 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 the parallel interface is shown in Table 11 together with their

execution time. Details about the parallel interface can be found in Section 11.1.

Examples of operations on a 4-bit bus are given in Table 38, on a 8-bit bus in Table 39,

Table 40 and Table 41.

When using the I2C-bus, the instruction has to be commenced with a control byte as

shown in Table 8. Details about the I2C-bus interface can be found in Section 11.2. An

example of operations on the I2C-bus is given in Table 42.

Table 8. Instruction set for I2C-bus commands

Control byte

Command byte

I2C-bus

command

CO RS 0 0 0 0 0 0 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 [1]

[1] R/W is set together with the slave address (see Figure 30).

Table 9. Control byte bit description

Bit

Symbol

Value

Description

7

CO

0

last control byte

1

another control byte follows after data/command

6

RS

0

instruction register selected

1

data register selected

4 to 0 -

0

default logic 0

Instructions are of 4 types, those that:

1. Designate PCF2119x functions like display format, data length, etc.

2. Set internal RAM addresses

3. Perform data transfer with internal RAM

4. Others, like read ‘busy flag’ and read ‘address counter’

In normal use, type 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 BF_AC instruction will be

executed. Because the busy flag is set to logic 1 while an instruction is being executed,

check to ensure it is logic 0 before sending the next instruction or wait for the maximum

instruction execution time, as given in Table 11. An instruction sent while the busy flag is

logic 1 will not be executed.

PCF2119X_5

Product data sheet

Rev. 05 — 13 August 2009

© NXP B.V. 2009. All rights reserved.

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