pcf8833 NXP Semiconductors, pcf8833 Datasheet - Page 37

• Manufacturer Part Number: pcf8833
• Description: Stn Rgb - 132 X 132 X 3 Driver
• Manufacturer: NXP Semiconductors

Philips Semiconductors
6.2.24.2
The RAM-to-display mapping for the non-rolling Scroll
mode when a 132
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
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.
Table 36 Set entry scroll point register bits
2003 Feb 14
handbook, full pagewidth
STN RGB - 132
D/C
0
1
1 buffer
row
1 unused
row
SA [ 7:0 ]
TF [ 7:0 ]
BF [ 7:0 ]
Fig.16 RAM to display mapping for the non-rolling Scroll mode (TF + SA + BF = 131) for LAO = 0.
Non-rolling Scroll mode
SEP7
7
0
130 (columns
RAM (132 x 132)
SEP6
6
0
132
132 display is
rows) display is
SEP5
3 driver
5
1
121
122
123
124
125
126
127
128
129
130
131
0
1
2
3
4
5
6
7
8
SEP4
4
1
37
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:
The non-rolling Scroll mode is left when the normal Display
mode on (NORON) or the partial Display mode on
(PTLON) is selected.
SEP3
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.
3
0
display (132 x 130)
SEP2
2
1
SEP1
1
1
MGU925
Objective specification
SEP0
120
121
124
125
126
127
128
129
130
131
131
0
0
1
2
3
4
5
6
7
8
0
1
PCF8833
TF [ 7:0 ]
SA [ 7:0 ]
BF [ 7:0 ]
DEFAULT
37H
00H
1