64CH Common Driver For Dot Matrix LCD
11
© 1998 Intech LCD Group Ltd.
FUNCTIONAL DESCRIPTION
1.RC Oscillator
The RC Oscillator generates CL2, M, FRM, of the KS0107B and CLK1, CLK2 of the KS0107B by the
oscillation resister R and capacitor C.
When selecting the master/slave, oscillation circuit is as following:
1)
Master Mode
KS0107B
KS0107B
R
R
CR
CR
C
C
R
f
C
f
open
open
External clock
2) Slave Mode
KS0107B
R
CR
C
open
open
V
DD
2.Timing Generation circuit
It generates CL2, M, FRM, CLK1, and CLK2 by the frequency from oscillation circuit.
1) Selection of Master/Slave (M/S)
When M/S is
“
H
”
, it generates CL2, M, FRM, CLK1, and CLK2 internally. When M/S is
“
L
”
,
it operates by receiving M, CLK2 from master device.
2) Frequency Selection (FS)
To adjust FRM by 70Hz, the oscillation frequency should be as following:
FS
Oscillation Frequency
H
f
OSC
=430KHz
L
f
OSC
=215KHz
In the slave mode, it is connected to V
DD.
