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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： 81/136页
文件大小： 2856K
代理商： M38D29FFFP
Rev.3.02
Apr 10, 2008
Page 49 of 131
REJ03B0177-0302
38D2 Group
LCD Power Circuit
The LCD power circuit has the dividing resistor for LCD power
which can be connected/disconnected with the LCD power
control register.
To use the LCD, apply a voltage externally to the VL3 pin and set
the VL3 connect bit to “1”. An external voltage should be applied
even if a voltage equivalent to VCC is used for the VL3 pin. When
the LCD is not used, perform either of the following.
Set the VL3 connect bit to “0” and leave the VL3 pin open.
Set the VL3 connect bit to “1” and apply a VCC level to VL3
pin.
Fig. 41 Structure of LCD power control register
Fig. 42 VL block diagram
Dividing resistor for LCD power control bit (LCDRON)
0 : Internal dividing resistor disconnected from LCD power circuit
1 : Internal dividing resistor connected to LCD power circuit
LCD power control register
(VLCON : address 001416)
b7
b0
VL pin input selection bit (VLSEL) (Note 2)
0 : Input invalid
1 : VL input function valid
Not used (Do not write to “1”.)
Dividing resistor for LCD power selection bits (RSEL) (Note 1)
b2b1
1 0 :
0 1 :
0 0 :
1 1 :
VL3 connection bit
0 : Connect LCD internal VL3 to VCC
1 : Connect LCD internal VL3 to VL3 pin
Notes 1: When voltage is applied to VL1 to VL3 by using the external resistor, write “102” to dividing resistor
for LCD power selection bits.
2: Setting to the VL pin input selection bit (VLSEL) = “1” has the most priority than setting to the port
P2 direction register (address 000516) and segment output disable register 2 (address 0FF616).
Larger resistor
Smaller resistor
Not used (Do not write to “1”.)
VL3
P27/SEG23/VL2
Bias control bit
(LCD mode register)
P26/SEG22/VL1
VL pin input
selection bit
Dividing resistor for LCD
power control bit
Vcc
Dividing resistor
for LCD power
Dividing resistor for LCD
power selection bits
VL3 connection bit
LCD internal VL3
LCD internal VL2
LCD internal VL1
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