Rev.1.04
REJ03B0188-0104
Aug 23, 2007
Page 47 of 146
4559 Group
(6) LCD control register
LCD control register L1
Register L1 controls duty/bias selection, LCD operation, internal
dividing resistor selection. Set the contents of this register
through register A with the TL1A instruction. The TAL1
instruction can be used to transfer the contents of register L1.
LCD control register L2
Register L2 controls internal dividing resistor operation,
selection of pin functions; SEG
0
/V
LC3
, SEG
1
/V
LC2
, SEG
2
/V
LC1
.
Set the contents of this register through register A with the TL2A
instruction.
LCD control register L3
Register L3 controls selection of pin functions; P2
0
/SEG
24
to
P2
3
/SEG
27
. Set the contents of this register through register A
with the TL3A instruction.
LCD control register C1
Register C1 controls selection of pin functions; P0
0
/SEG
16
to
P0
3
/SEG
19
. Set the contents of this register through register A
with the TC1A instruction.
LCD control register C2
Register C2 controls selection of pin functions; P1
0
/SEG
20
to
P1
3
/SEG
23
. Set the contents of this register through register A
with the TC2A instruction.
LCD control register C3
Register C3 controls selection of pin functions; P3
0
/SEG
28
to
P3
3
/SEG
31
. The contents of this register through register A with
the TC3A instruction.
Note 1.“R” represents read enabled, and “W” represents write enabled.
Note 2.“r (resistor) multiplied by 3” is used at 1/3 bias, and “r multiplied by 2” is used at 1/2 bias.
Note 3.V
LC3
is connected to V
DD
internally when SEG
0
pin is selected.
Note 4.Use internal dividing resistor when SEG
1
and SEG
2
pins are selected.
Table 19 LCD control registers (1)
LCD control register L1
at reset : 0000
2
at power down : state retained
R/W
TAL1/TL1A
L1
3
Internal dividing resistor for LCD power
supply selection bit (Note 2)
0
1
0
1
2r × 3, 2r × 2
r × 3, r × 2
Stop (OFF)
Operating
L1
L1
2
LCD control bit
LCD duty and bias selection bits
L1
1
Duty
Bias
L1
1
0
0
Not available
Not available
0
1
1/2
1/2
1
0
1/3
1/3
L1
0
1
1
1/4
1/3
LCD control register L2
at reset : 0000
2
at power down : state retained
W
TL2A
L2
3
SEG
0
/V
LC3
pin function switch bit (Note 3)
0
1
0
1
0
1
0
1
SEG
0
V
LC3
SEG
1
V
LC2
SEG
2
V
LC1
Internal dividing resistor valid
Internal dividing resistor invalid
L2
2
SEG
1
/V
LC2
pin function switch bit (Note 4)
L2
1
SEG
2
/V
LC1
pin function switch bit (Note 4)
L2
0
Internal dividing resistor for LCD power
supply control bit
LCD control register L3
at reset : 1111
2
at power down : state retained
W
TL3A
L3
3
P2
3
/SEG
27
pin function switch bit
0
1
0
1
0
1
0
1
SEG
27
P2
3
SEG
26
P2
2
SEG
25
P2
1
SEG
24
P2
0
L3
2
P2
2
/SEG
26
pin function switch bit
L3
1
P2
1
/SEG
25
pin function switch bit
L3
0
P2
0
/SEG
24
pin function switch bit