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
6.2.24.2 Non-rolling Scroll mode
The RAM-to-display mapping for the non-rolling Scroll
mode when a 132 × 130 (columns × rows) display is
connected to the PCF8833 is illustrated in Fig.16. In this
case unused rows and columns are to be left open, for
instance row 0 and 131. If a 132 × 132 display is
connected to the PCF8833 the content of row 0 and 131
will be the same as the content which is displayed in row 1
and 130, respectively. By doing so, the display data RAM
will have 1 row in the background, whose content can be
updated when it is not displayed.
The non-rolling Scroll mode is activated when the Set
Entry Scroll point is set; see Table Fig.36.
An example is given in Figure 17 for the case when the
PCF8833 is working in the non-rolling Scroll mode
(TF + SA + BF = 131).
When the non-rolling Scroll mode is used the following
sequence can be applied:
• Fill the background memory
• After the desired time interval increment the scroll
address to SEP + n for a n-line step
• Keep filling the background memory and incrementing
scroll address (SEP) at regular intervals to obtain a
smooth scrolling.
The non-rolling Scroll mode is left when the normal Display
mode on (NORON) or the partial Display mode on
(PTLON) is selected.
Table 36 Set entry scroll point register bits
D/C
7
6
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] − 1
1 buffer
row
121
122
123
1 unused
124
row
125
126
BF [7:0]
127
128
129
130
131
120
121
124
125
126
127
128
129
130
131
131
MGU925
BF [7:0]
Fig.16 RAM to display mapping for the non-rolling Scroll mode (TF + SA + BF = 131) for LAO = 0.
2003 Feb 14
37
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