PCF2113DUSLASH2SLASHF4 datasheet(12/65 Pages) NXP

12 / 65 page

PCF2113_FAM_4

Product data sheet

Rev. 04 — 4 March 2008

12 of 65

NXP Semiconductors

PCF2113x

LCD controllers/drivers

8.8 Address counter

The Address Counter (AC) assigns addresses to the DDRAM and CGRAM for reading

and writing and is set by the commands ‘set DDRAM address’ and ‘set CGRAM address’.

After a read/write operation the address counter is automatically incremented or

decremented by 1. The address counter contents are output to the bus (DB6 to DB0)

when bit RS = 0 and bit R/W=1.

8.9 Display data RAM

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 4. With no display shift the characters represented by the codes in the ﬁrst 24 RAM

locations starting at address 00h in line 1 are displayed. Figure 5 and Figure 6 show the

display mapping for right and left shift respectively.

When data is written to or read from the DDRAM, wrap-around occurs from the end of one

line to the start of the next line. When the display is shifted each line wraps around within

itself, independently of the others. Thus all lines are shifted and wrapped around together.

The address ranges and wrap-around operations for the various modes are shown in

Table 7.

Fig 4.

DDRAM to display mapping: no shift

Fig 5.

DDRAM to display mapping: right shift

00 01 02 03 04

15 16 17 18 19

4C 4D 4E 4F

non-displayed DDRAM addresses

64 65 66 67

40 41 42 43 44

49 4A 4B 4C 4D

00 01 02 03 04

09 0A 0B 0C 0D

24 25 26 27

non-displayed DDRAM address

line 1

line 2

mge991

DDRAM

address

2-line display

12345

22 23 24

12345

10 11 12

12345

10 11 12

display

position

DDRAM

address

1-line display

mge992

27 00 01 02 03

67 40 41 42 43

08 09 0A

48 49 4A

DDRAM

address

line 1

line 2

2-line display

22 23 24

10 11 12

4F 00 01 02 03

14 15 16

display

position

DDRAM

address

1-line display

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