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 speciï¬cation
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
7
D6
5
0
0
0
1
1
SEP7
SEP6
SEP5
4
1
SEP4
3
0
SEP3
2
1
SEP2
1
1
SEP1
0
1
SEP0
DEFAULT
37H
00H
handbook, full pagewidth
TF [7:0]
RAM (132 x 132)
0
1
2
3
4
5
6
7
8
display (132 x 130)
0
0
1
2
3
4
TF [7:0]
5
6
7
8
SA [7:0]
SA [7:0]
121
2 unused
122
rows
123
124
125
126
BF [7:0]
127
128
129
130
131
120
121
124
125
126
127
128
129
130
131
131
MGU923
BF [7:0]
Fig.14 RAM to display mapping for the rolling Scroll mode (TF + SA + BF = 130) for LAO = 0.
2003 Feb 14
35
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