PCF2104CUSLASH2 datasheet(36/56 Pages) MOTOROLA

36 / 56 page

1997 Dec 16

Philips Semiconductors

Product speciﬁcation

LCD controller/driver

PCF2104x

17.1

8-bit operation, 2

× 12 display using internal

reset

Table 7 shows an example of a 1-line display in 8-bit

operation. The PCF2104x 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 the display position only and DDRAM contents

remain unchanged. Display data entered first can be

displayed when the ‘Return home’ instruction is

performed.

17.2

4-bit operation, 2

× 12 display using internal

reset

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

Table 6 shows an example. When power is turned on, 8-bit

operation is automatically selected and the PCF2104x

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 6 step 3).

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

17.3

8-bit operation, 2

× 24 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 8). It should be noted

that both lines of the display are always shifted together,

data does not shift from one line to the other.

17.4

I2C operation, 2

× 12 display

A control byte is required with most instructions

(see Table 9).

17.5

Initializing by instruction

If the power supply conditions for correctly operating the

internal reset circuit are not met, the PCF2104x must be

initialized by instruction. Tables 10 and 11 show how this

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

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