ra8835 Topway Display, ra8835 Datasheet - Page 17

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

RAiO TECHNOLOGY INC.
Version 1.7
For example, if the character width is 10 pixels, then the address range is equal to twice the
number of characters, less 2. See Section 17-1-1 for the calculation of C/R. [C/R] cannot be set to
a value greater than the address range. It can, however, be set smaller than the address range, in
which case the excess display area is blank. The number of excess pixels must not exceed 64.
6-2-1-12 L/F
Set the height, in lines, of a frame. The height in lines is equal to L/F + 1, where L/F can range
from 0 to 255.
HEX
6-2-1-11 C/R
Set the length, including horizontal blanking, of one line. The line length is equal to TC/R + 1,
where TC/ R can range from 0 to 255. TC/R must be greater than or equal to C/R + 4. Provided
this condition is satisfied, [TC/R] can be set according to the equation given in section 17-1-1 in
order to hold the frame period constant and minimize jitter for any given main oscillator frequency,
f
HEX
HEX
FE
OSC
7F
FF
00
01
FE
FF
00
01
52
EE
EF
4F
↓
↓
00
01
↓
↓
↓
↓
.
D7
D7
0
0
↓
0
↓
1
1
D7
0
0
↓
0
↓
1
1
0
0
0
1
1
↓
↓
D6
D6
0
0
D6
↓
1
↓
1
1
0
0
1
1
1
↓
↓
0
0
1
1
1
↓
↓
D5
D5
D5
0
0
↓
0
↓
1
1
0
0
↓
1
↓
1
1
0
0
0
1
1
↓
↓
Table-5: Display Line Address Range
TC/R
C/R
L/F
Table-7: Frame Height Selection
D4
D4
0
0
↓
0
↓
0
0
D4
Table-6: Line Length Selection
0
0
↓
1
↓
1
1
0
0
1
1
1
↓
↓
D3
0
0
↓
1
↓
1
1
D3
D3
0
0
0
1
1
0
0
↓
1
↓
1
1
↓
↓
D2
0
0
↓
1
↓
1
1
D2
D2
0
0
0
1
1
0
0
1
1
1
↓
↓
↓
↓
17/86
D1
0
0
↓
1
↓
1
1
D1
D1
0
0
1
1
1
↓
↓
0
0
↓
1
↓
1
1
D0
0
1
↓
1
↓
0
1
D0
D0
0
1
0
0
1
↓
↓
0
1
1
↓
↓
0
1
[C/R] bytes per display line
[TC/R] line length (bytes)
[L/F] lines per frame
239
240
255
256
80
128
255
256
83
1
2
↓
↓
1
2
↓
↓
1
2
↓
↓
Dot Matrix LCD Controller
www.raio.com.tw
RA8835