PCF8833 View Datasheet(PDF) - Philips Electronics
Part Name
Description
MFG CO.
'PCF8833' PDF : 112 Pages View PDF
Philips Semiconductors
STN RGB - 132 × 132 × 3 driver
Objective specification
PCF8833
6.2.24 VERTICAL SCROLLING DEFINITION
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:
• 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.
Figure 12 illustrates the 4 scrolling configurations that can be defined.
Table 34 Vertical scrolling definition register bits
D/C
7
6
5
4
3
2
1
0
DEFAULT
0
0
0
1
1
0
0
1
1
33H
1
TF7
TF6
TF5
TF4
TF3
TF2
TF1
TF0
00H
1
SA7
SA6
SA5
SA4
SA3
SA2
SA1
SA0
82H
1
BF7
BF6
BF5
BF4
BF3
BF2
BF1
BF0
00H
handbook, full pagewidth centre screen scroll
bottom screen scroll
top screen scroll
whole screen scroll
Fixed area (RAM content displayed)
Scrolling area
Fig.12 Scrolling modes on the display.
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.
MGU921
2003 Feb 14
33
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