PCF2113AU/10/F4 NXP [NXP Semiconductors], PCF2113AU/10/F4 Datasheet - Page 12
PCF2113AU/10/F4
Manufacturer Part Number
PCF2113AU/10/F4
Description
LCD controllers/drivers
Manufacturer
NXP [NXP Semiconductors]
Datasheet
1.PCF2113AU10F4.pdf
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NXP Semiconductors
PCF2113_FAM_4
Product data sheet
8.8 Address counter
8.9 Display data RAM
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.
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
locations starting at address 00h in line 1 are displayed.
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
Fig 4.
Fig 5.
7.
4. With no display shift the characters represented by the codes in the first 24 RAM
DDRAM to display mapping: no shift
DDRAM to display mapping: right shift
display
position
DDRAM
address
1-line display
DDRAM
address
2-line display
00 01 02 03 04
00 01 02 03 04
40 41 42 43 44
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
Rev. 04 — 4 March 2008
display
position
DDRAM
address
1-line display
DDRAM
address
2-line display
4F 00 01 02 03
27 00 01 02 03
67 40 41 42 43
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
22 23 24
10 11 12
10 11 12
15 16 17 18 19
09 0A 0B 0C 0D
49 4A 4B 4C 4D
non-displayed DDRAM address
non-displayed DDRAM addresses
22 23 24
10 11 12
10 11 12
14 15 16
08 09 0A
48 49 4A
mge992
Figure 5
line 1
line 2
24 25 26 27
64 65 66 67
LCD controllers/drivers
and
mge991
PCF2113x
4C 4D 4E 4F
Figure 6
© NXP B.V. 2008. All rights reserved.
line 1
line 2
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