參數(shù)資料
型號(hào)： M3826AMFA-XXXFP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 10 MHz, MICROCONTROLLER, PQFP100
封裝： PLASTIC, LQFP-100
文件頁(yè)數(shù)： 85/93頁(yè)
文件大?。?/td> 996K
代理商： M3826AMFA-XXXFP
Rev.2.00
May. 24, 2006
page 86 of 90
REJ03B0028-0200
3826 Group (A version)
3.3.11 Notes on LCD drive control circuit
(1)
Count source for LCDCK
The LCDCK count source selection bit (bit 7 of LCD mode register (address 3916)) is set to “0”
after reset, selecting f(XCIN)/32. The sub clock has stopped after reset. Therefore, turn on LCD
after starting the oscillation and stabilizing the oscillation. Select the LCDCK count source after the
corresponding clock source becomes stable.
(2)
STP instruction
When executing the STP instruction, execute the STP instruction after setting the LCD enable bit
to “0”. If the STP instruction is executed during LCD lighting, direct-current voltage will be applied
to the LCD panel.
(3)
When not using LCD
When not using an LCD, leave the LCD segment and common pins open. Connect the VL1 pin to
Vss, and the VL2 and VL3 pins to Vcc.
(4)
Using voltage multiplier circuit
When using the voltage multiplier, apply the limit voltage or less to the VL1 pin, then set the voltage
multiplier control bit to “1” (enabled). If above the limit voltage is applied to the VL1 pin, current
may flow in the voltage multiplier circuit at the time of the voltage multiplier circuit operation start.
For the limit value, refer to “3.1 Electrical characteristics”.
When not using the voltage multiplier, set the LCD output enable bit to “1”, then apply proper
voltage to the LCD power input pins (VL1–VL3).
When the LCD output enable bit is set to “0” (disabled), the Vcc voltage is applied to the VL3 pin
inside of this microcomputer.
(5)
LCD drive power supply
Power supply capacitor may be insufficient with the division resistance for LCD power supply, and
the characteristic of the LCD panel. In this case, there is the method of connecting the bypass
capacitor about 0.1–0.33
F to VL1–VL3 pins. The example of a strengthening measure of the LCD
drive power supply is shown in Figure 3.3.9.
Fig. 3.3.9 Strengthening measure example of LCD drive power supply
VL3
VL2
VL1
Connect by the shortest possible wiring.
Connect the bypass capacitor to the VL1–VL3 pins
as short as possible.
(Referential value: 0.1–0.33
F)
3826 group
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