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參數(shù)資料
| 型號： | M34559G6 |
| 廠商： | Renesas Technology Corp. |
| 英文描述： | SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單芯片4位微機(jī)的CMOS |
| 文件頁數(shù)： | 46/148頁 |
| 文件大?。?/td> | 1732K |
| 代理商： | M34559G6 |
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Rev.1.04
REJ03B0188-0104
Aug 23, 2007
Page 46 of 146
4559 Group
(5) LCD power supply circuit
Select the LCD power supply circuit suitable for the using LCD
panel.
The LCD power supply circuit is fixed by the followings;
The internal dividing resistor is controlled by bit 0 of register
L2.
The internal dividing resistor is selected by bit 3 of register L1.
The bias condition is selected by bits 0 and 1 of register L1.
Internal dividing resistor
The 4553 Group has the internal dividing resistor for LCD power
supply.
When bit 0 of register L2 is set to ì0, the internal dividing
resistor is valid. However, when the LCD is turned off by setting
bit 2 of register L1 to ì0, the internal dividing resistor is turned
off.
The same six resistor (r) is prepared for the internal dividing
resistor.
According to the setting value of bit 3 of register L1 and using
bias condition, the resistor is prepared as follows;
L1
3
= “0”, 1/3 bias used: 2r × 3 = 6r
L1
3
= “0”, 1/2 bias used: 2r × 2 = 4r
L1
3
= “1”, 1/3 bias used: r × 3 = 3r
L1
3
= “1”, 1/2 bias used: r × 2 = 2r
SEG
0
/V
LC3
pin
The selection of SEG
0
/V
LC3
pin function is controlled with the
bit 3 of register L2.
When the V
LC3
pin function is selected, apply voltage of V
LC3
<
V
DD
to the pin externally.
When the SEG
0
pin function is selected, V
LC3
is connected to
V
DD
internally.
SEG
1
/V
LC2
, SEG
2
/V
LC1
pin
The selection of SEG
1
/V
LC2
pin function is controlled with the
bit 2 of register L2.
The selection of SEG
2
/V
LC1
pin function is controlled with the
bit 1 of register L2.
When the V
LC2
pin and V
LC1
pin functions are selected and the
internal dividing resistor is not used, apply voltage of 0 < V
LC1
<
V
LC2
< V
LC3
to these pins. Short the V
LC2
pin and V
LC1
pin at
1/2 bias.
When the V
LC2
pin and V
LC1
pin functions are selected and the
internal dividing resistor is used, the dividing voltage value
generated internally is output from the V
LC1
pin and V
LC2
pin.
The V
LC2
pin and V
LC1
pin have the same electric potential at
1/2 bias.
When SEG1 and SEG2 pin functions are selected, use the
internal dividing resistor (L2
0
= ”0”). In this time, V
LC2
and
V
LC1
are connected to the generated dividing voltage.
Fig 47. LCD power supply circuit example (1/3 bias condition selected)
V
SS
V
LC3
V
LC2
V
LC1
V
LC3
SEG
1
SEG
2
(b) Register L2 = (1000)
2
V
SS
V
LC3
V
LC2
V
LC1
SEG
1
SEG
2
(a) Register L2 = (0000)
2
V
SS
V
LC3
V
LC2
V
LC1
V
LC3
(d) Register L2 = (1111)
2
V
SS
V
LC3
V
LC2
V
LC1
V
LC3
(c) Register L2 = (1110)
2
External power supply
SEG
0
V
LC2
V
LC1
V
LC2
V
LC1
External power supply
External power supply
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