PCF8833USLASH2DA datasheet(33/112 Pages) PHILIPS

33 / 112 page

2003 Feb 14

Philips Semiconductors

Objective speciﬁcation

STN RGB - 132

× 132 × 3 driver

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

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.

D/C

76543210

DEFAULT

000110011

33H

1TF7

TF6

TF5

TF4

TF3

TF2

TF1

TF0

00H

1SA7

SA6

SA5

SA4

SA3

SA2

SA1

SA0

82H

1BF7

BF6

BF5

BF4

BF3

BF2

BF1

BF0

00H

handbook, full pagewidth

MGU921

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.

PCF8833U/2DA 数据表(PDF) 33 Page - NXP Semiconductors

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