64CH Segment Driver For Dot Matrix LCD 17
RS
L
R/W
L
FUNCTION
Instruction
H
Status read (busy check)
H
L
H
Data write (from input register to display data RAM )
Data read (from display data RAM to output register)
4. Reset
The system can be initialized by setting RSTB terminal at low level when turning power on,
receiving instruction from MPU. When RSTB becomes low, following procedure is occurred.
1. Display off
2. Display start line register become set by 0.(Z-address 0)
While RSTB is low, No instruction except status read can by accepted. Therefore, execute
other instructions after making sure that DB4= (clear RSTB) and DB7=0 (ready) by status read
instruction.
The conditions of power supply at initial power up are shown in table 1.
Table 1. Power Supply Initial Conditions
ITEM
SYMBOL
MIN
1.0
-
TYP
MAX
-
UNIT
us
Reset Time
Rise Time
tRS
tR
-
-
200
ns
4.5[V]
VDD
tRS
tR
0.7VDD
0.3VDD
RSTB
5. Busy flag
Busy flag indicates that KS0108B is operating or no operating. When busy flag is high,
KS0108B is in internal operating .
When busy flag is low, KS0108B can accept the data or instruction.
DB7indicates busy flag of the KS0108B.
E
Busy Flag
T Busy
1/fCLK<T Busy<3/fCLK
fCLK is CLK1, CLK2 Frequency
HB [ HB ELECTRONIC COMPONENTS ]
