PCF2105 datasheet(18/48 Pages) PHILIPS

18 / 48 page

1998 Jul 30

Philips Semiconductors

Product speciﬁcation

LCD controller/driver

PCF2105

Table 4

Command bit identities, used in Table 3

BIT

LOGIC 0

LOGIC 1

I/D

decrement

increment

display freeze

display shift

display off

display on

cursor off

cursor on

character at cursor position does not blink

character at cursor position blinks

S/C

cursor move

display shift

R/L

left shift

right shift

4 bits

8 bits

N (M = 0)

2 lines

× 12 characters; MUX rate 1 : 16

2 lines

× 24 characters; MUX rate 1 : 32

N (M = 1)

reserved

4 lines

× 12 characters; MUX rate 1 : 32

end of internal operation

internal operation in progress

last control byte, only data bytes to follow

next two bytes are a data byte and another control byte

9.3

Entry mode set

9.3.1

I/D

When bit I/D = 1 (0), the DDRAM or CGRAM address

increments (decrements) by 1 when data is written to or

read from the DDRAM or CGRAM. The cursor or blink

position moves to the right when incremented and to the

left when decremented. The cursor and blink are inhibited

when the CGRAM is accessed.

9.3.2

When bit S = 1, the entire display shifts either to the right

(bit I/D = 0) or to the left (I/D = 1) during a DDRAM write.

Consequently, it looks as if the cursor stands still and the

display moves. The display does not shift when reading

from the DDRAM, or when writing to or reading from the

CGRAM. When S = 0 the display does not shift.

9.4

Display control

9.4.1

The display is on when bit D = 1 and off when D = 0.

Display data in the DDRAM is not affected and can be

displayed immediately by setting D to logic 1.

9.4.2

The cursor is displayed when bit C = 1 and inhibited when

C = 0. Even if the cursor disappears, the display functions,

I/D, etc. remain in operation during display data write.

The cursor is displayed using 5 dots in the 8th line

(see Fig.7).

9.4.3

The character indicated by the cursor blinks when

bit B = 1. The blink is displayed by switching between

display characters and all dots on with a period of

1 second when fosc = 150 kHz (see Fig.7).

At other clock frequencies the blink period is equal to

The cursor and the blink can be set to display

simultaneously.

9.5

Cursor/display shift

‘Cursor/display shift’ moves the cursor position or the

display to the right or left without writing or reading display

data. This function is used to correct a character or move

the cursor through the display. In the 2 or 4-line display,

the cursor moves to the next line when it passes the last

position of the line (40 or 20 decimal). When the displayed

data is shifted repeatedly all lines shift at the same time;

displayed characters do not shift into the next line.

The Address Counter (AC) content does not change if the

only action performed is shift display, but increments or

decrements with the cursor shift.

150 kHz

osc

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