64CH Common Driver For Dot Matrix LCD 11
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
CR
KS0107B
CR
R
C
R
C
open
open
External clock
Cf
2) Slave Mode
KS0107B
CR
C
R
open
open
VDD
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
H
OSCILLATION FREQUENCY
fOSC=430KHz
L
fOSC=215KHz
In the slave mode, it is connected to VDD.
HB [ HB ELECTRONIC COMPONENTS ]
