PCF2116CUSLASH12 datasheet(42/64 Pages) NXP

42 / 64 page

1997 Apr 07

Philips Semiconductors

Product speciﬁcation

LCD controller/drivers

PCF2116 family

18.1

8-bit operation, 1-line display using internal

reset

Table 6 shows an example of a 1-line display in 8-bit

operation. The PCF2116 functions must be set by the

‘Function set’ instruction prior to display. Since the display

data RAM 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 DDRAM contents

remain unchanged, display data entered first can be

displayed when the Return Home operation is performed.

18.2

4-bit operation, 1-line display using internal

reset

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

Table 5 shows an example. When power is turned on, 8-bit

operation is automatically selected and the PCF2116

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 5 step 3).

Thus, DB4 to DB7 of the function set are written twice.

18.3

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 eighth

character is completed (see Table 7). Note that both lines

of the display are always shifted together; data does not

shift from one line to the other.

18.4

I2C operation, 1-line display

A control byte is required with most instructions

(see Table 8).

18.5

Initializing by instruction

If the power supply conditions for correctly operating the

internal reset circuit are not met, the PCF2116 must be

initialized by instruction. Tables 9 and 10 show how this

may be performed for 8-bit and 4-bit operation.

Table 5

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

STEP

INSTRUCTION

DISPLAY

OPERATION

power supply on (PCF2116 is initialized by

the internal reset circuit)

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 on/off 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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