PCF2105MUSLASH2 datasheet(34/48 Pages) PHILIPS

34 / 48 page

1998 Jul 30

Philips Semiconductors

Product speciﬁcation

LCD controller/driver

PCF2105

17.1

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 PCF2105

attempts to perform the first write as an 8-bit operation.

Since nothing is connected to DB3 to DB0, 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, DB7 to DB4 of the ‘function set’ are written twice.

17.2

8-bit operation, 2

× 12 display using internal

reset

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

operation. The PCF2105 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 the

display position only DDRAM contents remain unchanged.

Display data entered first can be displayed when the

‘return home’ instruction is performed.

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 8th

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-bus 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 PCF2105 must be

initialized by instruction. Tables 10 and 11 show how this

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

PCF2105MU/2 датащи(PDF) 34 Page - NXP Semiconductors

PCF2105MU/2 датащи(HTML) 34 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48

датащи скачать

ссылки URL