PCF2119AUSLASH2DASLASH2 datasheet(58/79 Pages) NXP

58 / 79 page

PCF2119X_5

Product data sheet

Rev. 05 — 13 August 2009

58 of 79

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 38). 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 38 step 3).

Thus, DB4 to DB7 of the Function_set are written twice.

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

Table 39 and Table 40 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 38.

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

Step

Instruction

Display

Operation

R/W DB7 DB6 DB5 DB4

power supply on

initialized by the external reset; no display appears

Function_set

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

8-bit by initialization and only this instruction completes with

one write

000010

Function_set

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

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

000010

000000

Display_ctl

turns display and cursor on; entire display is blank after

initialization

000000

001110

Entry_mode_set

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

000000

000110

Write_data to CGRAM/DDRAM

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

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

shifted to the right

100101

100000

Table 39.

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

Step

Instruction

Display

Operation

R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0

power supply on

initialized by the external reset; no

display appears

Function_set

sets to 8-bit operation, selects 1-line

display and VLCD =V0

0000110000

Display_ctl

turns on display and cursor; entire

display is blank after initialization

0000001110

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