PCF2104CUSLASH2 datasheet(22/56 Pages) MOTOROLA

22 / 56 page

1997 Dec 16

Philips Semiconductors

Product speciﬁcation

LCD controller/driver

PCF2104x

9.1

Clear display

‘Clear display’ writes space code 20 (hexadecimal) into all

DDRAM addresses (the character pattern for character

code 20 must be a blank pattern), sets the DDRAM

Address Counter to logic 0 and returns the display to its

original position if it was shifted. Consequently, the display

disappears and the cursor or blink position goes to the left

edge of the display (the first line if 2 or 4 lines are

displayed) and sets the entry mode to I/D = logic 1

(increment mode). S of entry mode does not change.

The instruction ‘Clear display’ requires extra execution

time. This may be allowed for by checking the Busy Flag

(BF) or by waiting until 2 ms has elapsed. The latter must

be applied where no read-back options are foreseen, as in

some chip-on-glass (COG) applications.

9.2

Return home

‘Return home’ sets the DDRAM Address Counter to

logic 0 and returns the display to its original position if it

was shifted. DDRAM contents do not change. The cursor

or blink position goes to the left of the display (the first line

if 2 or 4 lines are displayed). I/D and S of entry mode do

not change.

9.3

Entry mode set

9.3.1

I/D

When I/D = logic 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 S = logic 1, the entire display shifts either to the right

(I/D = logic 0) or to the left (I/D = logic 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 = logic 0 the display does not

shift.

9.4

Display on/off control

9.4.1

The display is on when D = logic 1 and off when

D = logic 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 C = logic 1 and inhibited

when C = logic 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.9).

9.4.3

The character indicated by the cursor blinks when

B = logic 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.9). At other clock

frequencies the blink period is equal to 150 kHz/fosc.

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 2 or 4-line displays, 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.

9.6

Function set

9.6.1

DL (PARALLEL MODE ONLY)

Sets interface data width. Data is sent or received in bytes

(DB7 to DB0) when DL = logic 1 or in two nibbles

(DB7 to DB4) when DL = logic 0. When 4-bit width is

selected, data is transmitted in two cycles using the

parallel bus(1).

Function set from I2C-bus interface: DL bit can not bet set

to logic 0 from the I2C-bus interface. If bit DL has been set

to logic 0 via the parallel bus, programming via the I2C-bus

interface is complicated.

9.6.2

N, M

Sets number of display lines.

(1) In a 4-bit application DB3 to DB0 are left open (internal

pull-ups). Hence in the ﬁrst function set instruction after

power-on G and H are set to 1. A second function set must

then be sent (2 nibbles) to set G and H to their required

values.

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