pcf8833 NXP Semiconductors, pcf8833 Datasheet - Page 33

• Manufacturer Part Number: pcf8833
• Description: Stn Rgb - 132 X 132 X 3 Driver
• Manufacturer: NXP Semiconductors

Philips Semiconductors
6.2.24
In the PCF8833 three different scrolling modes can be used. These scrolling modes differ from each other in the way the
RAM to display mapping is done. The vertical scrolling is defined as follows:
Figure 12 illustrates the 4 scrolling configurations that can be defined.
Table 34 Vertical scrolling definition register bits
There are 3 different scrolling modes, which are selected as follows:
1. TF + SA + BF = 130 rolling Scroll mode; see Section 6.2.24.1
2. TF + SA + BF = 131 non-rolling Scroll mode; see Section 6.2.24.2
3. TF + SA + BF = 132 non-rolling Scroll mode; see Section 6.2.24.3.
The recommended sequence for setting up the scroll modes is illustrated in Fig.13.
2003 Feb 14
handbook, full pagewidth
Vertical scrolling definition (VSCRDEF) command
TF[7:0] defines the number of lines for the top fixed area on the display, there is no top fixed area when TF[7:0] = 0
SA[7:0] defines the number of lines for the scrolling area on the display
BF[7:0] defines the number of lines for the bottom fixed area on the display, there is no bottom fixed area when
BF[7:0] = 0.
STN RGB - 132
D/C
0
1
1
1
V
ERTICAL SCROLLING DEFINITION
SA
BF
TF
7
0
7
7
7
centre screen scroll
Fixed area (RAM content displayed)
Scrolling area
SA
BF
TF
6
0
132
6
6
6
3 driver
SA
BF
TF
Fig.12 Scrolling modes on the display.
5
1
bottom screen scroll
5
5
5
SA
BF
TF
4
1
4
4
4
33
SA
BF
TF
3
0
top screen scroll
3
3
3
SA
BF
TF
2
0
2
2
2
whole screen scroll
SA
BF
TF
1
1
1
1
1
Objective specification
MGU921
SA
BF
TF
0
1
PCF8833
0
0
0
DEFAULT
33H
00H
82H
00H