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參數(shù)資料
| 型號： | S1C63358F0A0100 |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 4.1 MHz, MICROCONTROLLER, PQFP100 |
| 封裝： | PLASTIC, QFP15-100 |
| 文件頁數(shù)： | 27/38頁 |
| 文件大?。?/td> | 1226K |
| 代理商： | S1C63358F0A0100 |
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S1C63358 TECHNICAL MANUAL
EPSON
23
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Setting of Power Supply and Operating Mode)
4.2 Setting of Power Supply and Operating Mode
This section explains how to control the operating mode according to the supply voltage. Refer to Section
2.1, "Power Supply" for the configuration of the power supply circuit.
4.2.1 Control of supply voltage
When the voltage value necessary to drive the oscillation system voltage regulator is not provided from
the power supply voltage supplied externally, the S1C63358 drives the power supply circuit using the
voltage VC2 generated by the LCD booster circuit. The supply voltage VC2 is controlled using the register
LPWR.
For normal operation:
Set LPWR = "0" or LPWR = "1", if LCD is used
To use VC2 supply voltage:
Set LPWR = "1"
The supply voltage VC2 is common to the oscillation system voltage regulator and the A/D converter
voltage circuit. Therefore when using the VC2 voltage for either of these circuits, turn on the LCD booster
circuit. The VC2 voltage is output from the LCD booster circuit.
The oscillation system voltage regulator and the A/D converter voltage circuit can independently select
the drive voltage among VDD and VC2. This operation mode is controlled using the register VDSEL for
the oscillation system voltage regulator and the register VADSEL for the A/D converter voltage circuit.
By writing "1" to the register, VC2 is selected as the drive voltage and writing "0" selects VDD. Approxi-
mately 100 msec is necessary until the VC2 voltage stables after turning the LCD booster ON by the
LPWR. Therefore, the operating mode should be switched as in the following sequence.
Normal mode
→ VC2 mode
1. Turn the LCD booster ON (set LPWR = "1").
2. Maintain 100 msec or more.
3. Set "1" in the VDSEL (for the oscillation system voltage regulator) or VADSEL (for the A/D converter
voltage circuit).
VC2 mode
→ Normal mode
1. Set "0" in the VDSEL or VADSEL.
2. Turn the LCD booster OFF (set LPWR = "0" , if LCD is unused).
Note: If the power supply voltage is out of the specified voltage range for an operating mode, do not
switch into the operating mode. It may cause malfunction or increase current consumption.
When operating the S1C63358 with a 0.9–1.4 V power supply voltage, software control is
necessary. Set the oscillation system voltage regulator into the VC2 mode. When 1.4 V or more
power supply voltage is used, don't set the oscillation system voltage regulator into the VC2
mode. At initial reset the normal mode is set.
When using the A/D converter circuit with a 0.9–1.6 V power supply voltage, software control is
necessary. Set the A/D converter circuit into the VC2 mode. When 1.6 V or more power supply
voltage is used, don't set the A/D converter circuit into the VC2 mode. At initial reset the normal
mode is set.
4.2.2 Operating mode for the oscillation system voltage regulator
and the internal operating voltage
The oscillation system voltage regulator generates the operating voltage VD1 for the oscillation circuit and
internal logic circuits. This VD1 voltage must be switched according to the oscillation circuit to be used.
Further the operating mode for the oscillation system voltage regulator must be switched depending on
the power supply voltage.
Control of VD1 and the oscillation circuit will be explained in Section 4.4, "Oscillation Circuit". This
section explains the operating mode for the oscillation system voltage regulator that must be set before
controlling them. The following shows the setting contents according to the power supply voltage and
the oscillation circuit.
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