PCF88331 datasheet(35/112 Pages) PHILIPS

35 / 112 page

2003 Feb 14

Philips Semiconductors

Objective speciﬁcation

STN RGB - 132

× 132 × 3 driver

PCF8833

6.2.24.1

Rolling Scroll mode

The RAM-to-display mapping for the rolling Scroll mode

when a 132

× 130 (columns × rows) display is connected

to the PCF8833 is illustrated in Fig.14. In this case rows

0 and 131 must be left open. When a 132

× 132 display is

connected, there will be a one-to-one mapping between

the RAM and the display, and there will be no unused

rows.

The rolling Scroll mode is activated when the Set Entry

Scroll Point (SEP) is set; see Table 35.

Figure 15 gives an example for when the PCF8833 is

working in the rolling Scroll mode.

When the rolling Scroll mode is used the following

sequence can be applied:

• After the desired time interval increment the scroll

address to SEP + n for a n-line step

• Keep incrementing the scroll address (SEP) at regular

intervals.

The rolling Scroll mode is left when the normal Display

mode on (NORON) or the partial Display mode on

(PTLON) is selected.

Table 35 Set entry scroll point register bits

D/C

543210

DEFAULT

000110111

37H

SEP7

SEP6

SEP5

SEP4

SEP3

SEP2

SEP1

SEP0

00H

handbook, full pagewidth

126

129

130

131

127

128

123

122

121

124

125

TF[7:0]

SA[7:0]

BF[7:0]

TF[7:0]

SA[7:0]

BF[7:0]

RAM (132 x 132)

127

130

131

128

129

124

121

120

125

126

display (132 x 130)

2 unused

rows

MGU923

Fig.14 RAM to display mapping for the rolling Scroll mode (TF + SA + BF = 130) for LAO = 0.

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