参数资料
型号: M38D29FFFP
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 6.25 MHz, MICROCONTROLLER, PQFP64
封装: 14 X 14 MM, 0.80 MM PITCH, PLASTIC, LQFP-64
文件页数: 80/136页
文件大小: 2856K
代理商: M38D29FFFP
Rev.3.02
Apr 10, 2008
Page 48 of 131
REJ03B0177-0302
38D2 Group
Bias Control and Applied Voltage to LCD Power Input
Pins
When the voltage is applied from the LCD power input pins
(VL1
VL3), set the VL pin input selection bit (bit 5 of the LCD
power control register) and VL3 connection bit (bit 6 of LCD
power control register) to “1”, apply the voltage value shown in
Table 12 according to the bias value. In this case, SEG22 pin and
SEG23 pin cannot be used.
Select a bias value by the bias control bit (bit 2 of the LCD mode
register).
Note: VLCD is the maximum value of supplied voltage for the
LCD panel.
Common Pin and Duty Ratio Control
The common pins (COM0
COM3) to be used are determined by
duty ratio. Select duty ratio by the duty ratio selection bits (bits 0
and 1 of the LCD mode register). When reset is released, VCC
voltage is output from the common pin.
Note: Unused common pin outputs the unselected waveform.
Segment Signal Output Pin
The segment signal output pins (SEG0
SEG23) are shared with
ports P0
P2. When these pins are used as the segment signal
output pins, set the direction registers of the corresponding pins
to “1”, and set the segment output disable register to “0”.
Also, these pins are set to the input port after reset, the VCC
voltage is output by the pull-up resistor.
Fig. 40 Example of circuit at each bias (at external power input)
Table 12 Bias control and applied voltage to VL1
VL3
Bias value
Voltage value
1/3 bias
VL3 = VLCD
VL2 = 2/3 VLCD
VL1 = 1/3 VLCD
1/2 bias
VL3 = VLCD
VL2 = VL1 = 1/2 VLCD
Table 13 Duty ratio control and common pins used
Duty
ratio
Duty ratio selection bits
Common pins used
Bit 1
Bit 0
20
1
COM0, COM1
31
0
COM0
COM2
41
1
COM0
COM3
R4
R5
R4 = R5
Contrast adjust
1/2 bias
Contrast adjust
R1
R2
R3
R1 = R2 = R3
1/3 bias
VL1
VL3
VL2
VL1
VL3
VL2
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