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PCF2113AU

LCD controllers/drivers

Philips Electronics 

Philips Semiconductors

LCD controllers/drivers

Product specification

PCF2113x

9.3 Bit IM

When IM = 0, the chip is in character mode. In the

character mode characters and icons are driven

(MUX 1 : 18). The VLCD generator, if used, produces the

VLCD voltage programmed in register VA.

When IM = 1, the chip is in icon mode. In the icon mode

only the icons are driven (MUX 1 : 2) and the VLCD

generator, if used, produces the VLCD voltage as

programmed in register VB.

Table 7 Normal/icon mode operation

IM

MODE

0 character mode

1 icon mode

VLCD

generates VA

generates VB

9.4 Bit IB

Icon blink control is independent of the cursor/character

blink function.

When IB = 0, the icon blink is disabled. Icon data is stored

in CGRAM character 0 to 2 (3 × 8 × 5 = 120 bits for

120 icons).

When IB = 1, the icon blink is enabled. In this case each

icon is controlled by two bits. Blink consists of two half

phases (corresponding to the cursor on and off phases

called even and odd phases hereafter).

Icon states for the even phase are stored in CGRAM

characters 0 to 2 (3 × 8 × 5 = 120 bits for 120 icons).

These bits also define icon state when icon blink is not

used (see Table 9).

Icon states for the odd phase are stored in CGRAM

character 4 to 6 (another 120 bits for the 120 icons). When

icon blink is disabled CGRAM characters 4 to 6 may be

used as normal CGRAM characters.

9.5 Direct mode

When DM = 0, the chip is not in the direct mode. Either the

internal VLCD generator or an external voltage may be

used to achieve VLCD.

When DM = 1, the chip is in direct mode. The internal VLCD

generator is turned off and the VLCD2 output is directly

connected to the VLCD generator supply voltage VDD2.

The direct mode can be used to reduce the current

consumption when the required VLCD2 output voltage is

close to the VDD2 supply voltage. This can be the case in

icon mode or in Mux 1:9 (depending on LCD liquid

properties).

9.6 Voltage multiplier control

Bits S1 and S0

A software configurable voltage multiplier is incorporated

in the VLCD generator and can be set via the ‘Set HVgen

stages’ command.

The voltage multiplier control can be used to reduce

current consumption by disconnecting internal voltage

multiplier stages, depending on the required VLCD output

voltage (see Table 8).

Table 8 S1 and S0 control of voltage multiplier

S1

S0

DESCRIPTION

0

0 set VLCD generator stages to 1

(2 x voltage multiplier)

0

1 set VLCD generator stages to 2

(3 x voltage multiplier)

1

0 set VLCD generator stages to 3

(4 x voltage multiplier)

1

1 do not use

9.7 Screen configuration

Bit L

L = 0: the two halves of a split screen are connected in a

standard way i.e. column 1/61, 2/62 to 60/120; default.

L = 1: the two halves of a split screen are connected in a

mirrored way i.e. column 1/120, 2/119 to 60/61. This

allows single layer PCB or glass layout.

Table 9 Blink effect for icons and cursor character blink

PARAMETER

Cursor character blink

Icons

EVEN PHASE

block (all on)

state 1; CGRAM character 0 to 2

ODD PHASE

normal (display character)

state 2; CGRAM character 4 to 6

2001 Dec 19

30

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