PCF2113DH datasheet(48/72 Pages) PHILIPS

48 / 72 page

2001 Dec 19

Philips Semiconductors

Product speciﬁcation

LCD controllers/drivers

PCF2113x

16.2

4-bit operation, 1-line display using internal

reset

The program must set functions prior to a 4-bit operation

(see Table 12). 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 12 step 3). Thus, DB4 to DB7 of the

‘function set’ are written twice.

16.3

8-bit operation, 1-line display using internal

reset

Tables 13 and 14 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 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.

16.4

8-bit operation, 2-line display

For a 2-line display the cursor automatically moves from

the first to the second line after the 40th digit of the first line

has been written. Thus, if there are only 8 characters in the

first line, the DDRAM address must be set after the 8th

character is completed (see Table 15). It should be noted

that both lines of the display are always shifted together;

data does not shift from one line to the other.

16.5

I2C-bus operation, 1-line display

A control byte is required with most commands

(see Table 16).

Table 12 4-bit operation, 1-line display example using internal reset

STEP

INSTRUCTION

DISPLAY

OPERATION

power supply on (PCF2113x is initialized by

the internal reset)

initialized; no display appears

function set

R/W

DB7

DB6

DB5

DB4

sets to 4-bit operation; in this instance operation

is handled as 8-bits by initialization and only this

instruction completes with one write

000010

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

display control

000000

turns on display and cursor; entire display is

blank after initialization

001110

entry mode set

000000

sets mode to increment the address by 1 and to

shift the cursor to the right at the time of write to

the DD/CGRAM; display is not shifted

000110

‘write data’ to CGRAM/DDRAM

100101

writes ‘P’; the DDRAM has already been selected

by initialization at power-on; the cursor is

incremented by 1 and shifted to the right

100000

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