PCF2119RUSLASH2SLASHF2 datasheet(14/79 Pages) NXP

14 / 79 page

PCF2119X_5

Product data sheet

Rev. 05 — 13 August 2009

14 of 79

NXP Semiconductors

PCF2119x

LCD controllers/drivers

Display data RAM and ROM

9.1 DDRAM

The Display Data RAM (DDRAM) stores up to 80 characters of display data represented

by 8-bit character codes. RAM locations which are not used for storing display data can be

used as general purpose RAM.

The basic RAM to display addressing scheme is shown in Figure 6, Figure 7 and Figure 8.

With no display shift the characters represented by the codes in the ﬁrst 32 RAM locations

starting at address 00h are displayed in line 1.

All addresses are shown in hex.

Fig 6.

DDRAM to display mapping: no shift

All addresses are shown in hex.

Fig 7.

DDRAM to display mapping: right shift

00 01 02 03 04

1D 1E 1F 20 21

4C 4D 4E 4F

non-displayed DDRAM addresses

64 65 66 67

40 41 42 43 44

4D 4E 4F 50 51

00 01 02 03 04

0D 0E 0F 10 11

24 25 26 27

non-displayed DDRAM address

line 1

line 2

mgk892

DDRAM

address

2-line display/MUX 1 : 9 mode

12345

30 31 32

12345

14 15 16

12345

14 15 16

display

position

DDRAM

address

1-line display

mgl536

27 00 01 02 03

67 40 41 42 43

0C 0D 0E

4C 4D 4E

DDRAM

address

line 1

line 2

2-line display/MUX 1 : 9 mode

14 15 16

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