PCF2113X datasheet(12/72 Pages) PHILIPS

12 / 72 page

2001 Dec 19

Philips Semiconductors

Product speciﬁcation

LCD controllers/drivers

PCF2113x

7.11

Character Generator ROM (CGROM)

The CGROM generates 240 character patterns in a

× 8 dot format from 8-bit character codes.

Figures 7, 8, 9 and 10 show the character sets that are

currently implemented.

7.12

Character Generator RAM (CGRAM)

Up to 16 user defined characters may be stored in the

CGRAM. Some CGRAM characters (see Fig.16) are also

used to drive icons (6 if icons blink and both icon rows are

used in the application; 3 if no blink but both icon rows are

used in the application; 0 if no icons are driven by the icon

rows). The CGROM and CGRAM use a common address

space, of which the first column is reserved for the

CGRAM (see Fig.7). Figure 11 shows the addressing

principle for the CGRAM.

7.13

Cursor control circuit

The cursor control circuit generates the cursor underline

and/or cursor blink as shown in Fig.6 at the DDRAM

address contained in the address counter.

When the address counter contains the CGRAM address

the cursor will be inhibited.

7.14

Timing generator

The timing generator produces the various signals

required to drive the internal circuitry. Internal chip

operation is not disturbed by operations on the data buses.

7.15

LCD row and column drivers

The PCF2113x contains 18 row and 60 column drivers,

which connect the appropriate LCD bias voltages in

sequence to the display in accordance with the data to be

displayed. R17 and R18 drive the icon rows.

The bias voltages and the timing are selected

automatically when the number of lines in the display is

selected. Figures 12, 13, 14 and 15 show typical

waveforms. Unused outputs should be left unconnected.

MGA801

cursor

5 x 7 dot character font

alternating display

cursor display example

blink display example

Fig.6 Cursor and blink display examples.

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