RA6963
Preliminary Version 1.3
Dot Matrix LCD Controller
6-3 Row / Column and Oscillation Clock
The frequency of the crystal oscillator is adjusted by the following formula.
fOSC : Frequency of oscillation
fSCP : Frequency of shift clock (fSCP = fOSC / 2 )
fR
M
: Frequency of Frame
: Number of characters on one line (number of dots on one line =8M)
For all font sizes (e.g. 7 x 8, 7 x 8, 5 x 8) the oscillation frequency remains constant.
: Number of rows (Duty=1/8N)
N
1
fR
8M
fSCP
x 8N=
fOSC = fR x 64 x 2 x M x N
(fR = 60Hz)
< Table 6-2 >
40
Unit: MHz
M
32
64
80
Duty
N
Upper
Lower
Upper
Lower
Upper
Lower
Upper
Lower
Upper
Lower
Upper
Lower
Upper
Lower
Upper
Lower
0.492
0.983
0.983
1.966
1.475
2.949
1.966
3.932
2.458
4.915
2.949
5.898
3.440
6.881
3.932
7.864
0.614
1.229
1.229
2.458
1.843
3.685
2.458
4.915
3.072
6.144
3.686
7.373
4.300
8.601
4.915
9.830
0.983
1.966
1.966
3.932
2.949
5.898
3.932
7.864
4.915
9.830
5.898
11.776
6.881
13.763
7.864
15.729
1.229
2.458
2.458
4.915
3.688
7.372
4.915
9.830
6.144
12.288
7.373
14.746
8.602
17.203
9.830
19.660
1/16
1/32
1/48
1/64
1/80
1/96
1/112
1/128
2
4
6
8
10
12
14
16
Note 1: Upper Æ Single-Scan. Lower Æ Dual-Scan at fR = 60Hz
RAiO TECHNOLOGY INC.
www.raio.com.tw
11/46
RAIO [ RAIO TECHNOLOGY INC. ]
