NJU6535
(2) INSTRUCTIONS CODE
(2-1)
Duty select
Duty select instruction is which sets LCD driving duty ratio 1/3 or 1/4 duty.
No.43 terminal is change Common terminal or segment terminal shown below.
Table 1
DY
0
1
Duty ratio
1/3 Duty
1/4 Duty
No.40
COM1
COM1
No.40 to 43 terminal states
No.41
No.42
COM2
COM3
COM2
COM3
No.43
SEG40
COM4
(2-2)
E.V.R. resister set
E.V.R. resister set instruction adjusts the contrast of the LCD, and selects.
One LCD driving voltage VLCD out of 8 voltage-stages by setting E.V.R. register.
Set the binary code “000” when contrast adjustment is unused.
V
LCD
E0
E1
E2
V
LCD
(V
LCD
=V
0
-V
SS
)
1/2 bias
1/3 bias
0
0
0
VDD
VDD
High
0
0
1
0.933VDD
0.955VDD
:
0
1
0
0.875VDD
0.913VDD
:
0
1
1
0.824VDD
0.875VDD
:
1
0
0
0.778VDD
0.840VDD
:
1
0
1
0.737VDD
0.808VDD
:
1
1
0
0.700VDD
0.778VDD
:
1
1
1
0.667VDD
0.750VDD
Low
(2-3)
Power save mode set
Power save mode reduces the operating current of application using Display Off and selects a terminal
condition of Key scan signal output. The terminal, which is set to "L", does not output Key scan signal as
shown in following table.
Internal
OSC.
ON
Stop
Stop
Stop
Key scanning output terminals
S0
S1
Function
LCD output
ON
Display Off
Display Off
Display Off
S0
H
L
L
H
S1
H
L
L
H
0
0
Normal
0
1
Power save 1
1
0
Power save 2
1
1
Power save 3
*1 No scanning states.
states *1
S2 S3
H
H
L
L
L
L
H
H
S4
H
L
H
H
S5
H
H
H
H
(2-4)
Segment output / key scan output selection
This instruction assigns a function of output terminal either segment output or Key scan signal output to
5 terminals numbered from 44 to 45 as shown in following table.
No.44 to 49 terminal states
Maximum key
K0
K1
matrix
No.44 No.45 No.46 No.47 No.48 No.49
S0
S1
S2
S3
S4
S5
0
0
30 key
SEG41
S1
S2
S3
S4
S5
0
1
25 key
SEG41 SEG42
S2
S3
S4
S5
1
*
20 key
(*:Don’t care)
-6-
NJRC [ NEW JAPAN RADIO ]
