ra8835 Topway Display, ra8835 Datasheet - Page 41

• Manufacturer Part Number: ra8835
• Description: Dot Matrix Lcd Controller
• Manufacturer: Topway Display

RAiO TECHNOLOGY INC.
Version 1.7
7-10-3 Display Scan Timing
Note: One bit of display memory corresponds to one pixel.
Note: In two-panel drive, the RA8835 series reads line 1 and line b + 1 as one cycle. The upper
Figure 7-15 shows the basic timing of the RA8835 series. One display memory read cycle takes
nine periods of the system clock, ψ0 (f
When reading, the display memory pauses at the end of each line for (TC/R - C/R) display
memory read cycles, though the LCD drive signals are still generated. TC/R may be set to any
value within the constraints imposed by C/R, f
be used to fine tune the frame frequency. The microprocessor may also use this pause to access
the display memory data.
and lower panels are thus read alternately, one line at a time.
(L/F)/2=β
β+2
β+2
(L/F)
Figure 7-14: Two-panel Display Address Indexing
β+1
β+1
β+8
β+9
β+1
16
17
‧
‧
‧
‧
‧
‧
‧
‧
‧
‧
‧
‧
‧
‧
24
4
5
‧
‧
‧
‧
6
7
8
9
1
SAD1+AP
SAD
SAD1+2AP
SAD3+AP
SAD3+2AP
SAD3+1
WS=1,FX=8,FY=8
SAD+1
SAD1+AP
SAD3+AP
+1
+1
SAD1+AP
SAD3+AP
SAD1+2
SAD3+2
41/86
OSC
+2
+2
). This cycle repeats (C/R + 1) times per display line.
C/R
OSC
, f
FR
, and the size of the LCD panel, and it may
SAD3+C/R
SAD3+AP
SAD1+AP
SAD+C/R
+C/R
+C/R
Dot Matrix LCD Controller
www.raio.com.tw
RA8835