PCF2113DUSLASH2SLASHF4 datasheet(49/65 Pages) NXP

49 / 65 page

PCF2113_FAM_4

Product data sheet

Rev. 04 — 4 March 2008

49 of 65

NXP Semiconductors

PCF2113x

LCD controllers/drivers

16.2 General application information

The required minimum value for the external capacitors in an application with the

PCF2113x are: Cext ≥ 100 nF between VLCD and VSS, and Cext ≥ 470 nF between VDD and

VSS. Higher capacitor values are recommended for ripple reduction.

For COG applications the recommended Indium Tin Oxide (ITO) track resistance is to be

minimized for the I/O and supply connections. Optimized values for these tracks are below

Ω for the supply and below 100 Ω for the I/O connections. Higher track resistances

reduce performance and increase current consumption.

To avoid accidental triggering of power-on reset (especially in COG applications), the

supplies must be adequately decoupled. Depending on power supply quality, VDD1 may

have to be risen above the speciﬁed minimum.

16.3 4-bit operation, 1-line display using internal reset

The program must set functions prior to a 4-bit operation (see Table 21 ). When power is

turned on, 8-bit operation is automatically selected and the PCF2113x attempts to

perform the ﬁrst write as an 8-bit operation. Since nothing is connected to 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 21 step 3). Thus,

DB4 to DB7 of the ‘function set’ are written twice.

16.4 8-bit operation, 1-line display using internal reset

Table 22 and Table 23 show an example of a 1-line display in 8-bit operation. The

PCF2113x 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

Table 21.

4-bit operation, 1-line display example using internal reset

Step

Instruction

Display

Operation

internal power supply on (PCF2113x

is initialized by the internal reset)

initialized; no display appears

function set

sets a 4-bit operation; in this instance

operation is handled as 8-bit by

initialization and only this instruction

completes with one write

R/W DB7 DB6 DB5 DB4

000010

function set

sets to 4-bit operation, selects 1-line

display and VLCD = VA; 4-bit operation

starts from this point and resetting is

needed

000010

000000

display control

turns on display and cursor; entire

display is blank after initialization

000000

001110

entry mode set

sets mode to increment address by 1

and to shift the cursor to the right at the

time of write to the DDRAM/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

100101P

100000

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