PCF2103EUSLASH2SLASHF2 datasheet(23/56 Pages) PHILIPS

23 / 56 page

1998 May 11

Philips Semiconductors

Product speciﬁcation

LCD controllers/drivers

PCF2103 family

8.4

Display control (and partial power-down mode)

8.4.1

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

data in the DDRAM are not affected and can be displayed

immediately by setting D to logic 1.

When the display is off (D = 0) the chip is in partial

power-down mode:

• The LCD outputs are connected to V

• Bias generator is turned off.

3 oscillator cycles are required after sending the

‘display off’ instruction to ensure all outputs are at VSS,

afterwards OSC can be stopped. If the oscillator is running

during partial power-down mode (‘display off’) the chip can

still execute instructions. Even lower current consumption

is obtained by inhibiting the oscillator (OSC = VSS).

To ensure IDD <2 µA the parallel bus pins DB7 to DB0

should be connected to VDD; RS and R/W to VDD or left

open-circuit and PD to VDD. Recovery from power-down

mode: put PD back to logic 0, if necessary put OSC back

to VDD and send a ‘display control’ instruction with D = 1 to

enable the display again.

8.4.2

The cursor is displayed when 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.5).

8.4.3

The character indicated by the cursor blinks when B = 1.

The cursor character blink is displayed by switching

between display characters and all dots on with a period of

approximately 1 s, with

The cursor underline and the cursor character blink can be

set to display simultaneously.

8.5

Cursor or 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-line displays, the

cursor moves to the next line when it passes the last

position (40) of the line. When the displayed data is shifted

repeatedly all lines shift at the same time; displayed

characters do not shift into the next line.

BLINK

osc

52224

----------------

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

only action performed is shift display, but increments or

decrements with the ‘cursor shift’.

8.6

Function set

8.6.1

DL (PARALLEL MODE ONLY)

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

(DB7 to DB0) when DL = 1 or in two nibbles (DB7 to DB4)

when DL = 0. When 4-bit width is selected, data is

transmitted in two cycles using the parallel bus. In a 4-bit

application DB3 to DB0 should be left open-circuit (internal

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

power-on N and H are set to logic 1. A second

‘function set’ must then be sent (2 nibbles) to set N and H

to their required values.

‘Function set’ from the I2C-bus interface sets the DL bit to

logic 1.

8.6.2

Chooses either 1-line by 24 display (M = 0) or 2-line by

12 display (M = 1).

8.6.3

When H = 0 the chip can be programmed via the standard

11 instruction codes used in the PCF2116 and other LCD

controllers.

When H = 1 the extended range of instructions will be

used. These are mainly for controlling the display

configuration and the icons.

8.7

Set CGRAM address

‘Set CGRAM address’ sets bits 5 to 0 of the CGRAM

address ACG into the address counter (binary A[5] to A[0]).

Data can then be written to or read from the CGRAM.

Attention: the CGRAM address uses the same address

(binary A[6] to A[0]). With the ‘set CGRAM address’

command, only bits 5 down to 0 are set. Bit 6 can be set

using the ‘set DDRAM address’ command first, or by using

the auto-increment feature during CGRAM write.

All bits 6 to 0 can be read using the

‘read busy flag and address counter’ command.

When writing to the lower part of the CGRAM, ensure that

bit 6 of the address is not set (e.g. by an earlier DDRAM

write or read action).

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