PCF2119AU/2DA/2 데이터 시트보기 (PDF) - NXP Semiconductors.

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PCF2119AU/2DA/2

LCD controller/drivers

NXP Semiconductors. 

NXP Semiconductors

PCF2119x

LCD controllers/drivers

16.9 4-bit operation, 1-line display using external reset

The program must set functions prior to a 4-bit operation (see Table 39). When power is

turned on, 8-bit operation is automatically selected and the PCF2119x attempts to perform

the first write as an 8-bit operation. Since nothing is connected to ports DB0 to DB3, a

rewrite is then required. However, since one operation is completed in two accesses of

4-bit operation, a rewrite is required to set the functions (see Table 39 step 3). Thus,

DB4 to DB7 of the Function_set are written twice.

Table 39. 4-bit operation, 1-line display example; using external reset (character set ‘A’)

Step Instruction

Display Operation

RS R/W DB7 DB6 DB5 DB4

1

power supply on

initialized by the external reset; no display appears

2

Function_set

000010

sets to 4-bit operation; in this instance operation is handled as

8-bit by initialization and only this instruction completes with

one write

3

Function_set

000010

sets to 4-bit operation, selects 1-line display and VLCD = V0;

4-bit operation starts from this point and resetting is needed

000000

4

Display_ctl

000000

turns display and cursor on; entire display is blank after

initialization

001110

5

Entry_mode_set

000000

000110

sets mode to increment the address by 1 and to shift the cursor

to the right at the time of write to the DDRAM or CGRAM;

display is not shifted

6

Write_data to CGRAM/DDRAM

100101P

100000

writes ‘P’; the DDRAM has already been selected by

initialization at power-on; the cursor is incremented by 1 and

shifted to the right

16.10 8-bit operation, 1-line display using external reset

Table 40 and Table 41 show an example of a 1-line display in 8-bit operation. The

PCF2119x functions must be set by the Function_set instruction prior to display. Since the

DDRAM can store data for 80 characters, the RAM can be used for advertising displays

when combined with display shift operation. Since the display shift operation changes

display position only and the DDRAM contents remain unchanged, display data entered

first can be displayed when the Return_home operation is performed.

Table 40. 8-bit operation, 1-line display example; using external reset (character set ‘A’)

Step Instruction

Display Operation

RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0

1

power supply on

initialized by the external reset; no

display appears

2

Function_set

0000110000

sets to 8-bit operation, selects 1-line

display and VLCD = V0

3

Display_ctl

0000001110

turns on display and cursor; entire

display is blank after initialization

PCF2119X

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 9 — 14 April 2011

© NXP B.V. 2011. All rights reserved.

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