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參數(shù)資料
| 型號： | S1C6S460D |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 2 MHz, MICROCONTROLLER, UUC124 |
| 封裝： | 4.69 X 4.68 MM, DIE-124 |
| 文件頁數(shù)： | 33/107頁 |
| 文件大小： | 788K |
| 代理商： | S1C6S460D |
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S1C6S460 TECHNICAL MANUAL
EPSON
23
CHAPTER 5: OSCILLATION CIRCUIT
CHAPTER
5OSCILLATION CIRCUIT
5.1 Configuration of Oscillation Circuit
The S1C6S460 has two oscillation circuits (OSC1 and OSC3). OSC1 is a crystal oscillation circuit that
supplies the operating clock to the CPU and peripheral circuits. OSC3 is either a CR or a ceramic oscilla-
tion circuit. When processing with the S1C6S460 requires high-speed operation, the CPU operating clock
can be switched from OSC1 to OSC3 by the software. To stabilize operation of the internal circuits, the
operating voltage VS1 must be switched according to the oscillation circuit to be used. Figure 5.1.1 is the
block diagram of this oscillation system.
Oscillation circuit control signal
CPU clock selection signal
To CPU
To peripheral
circuits
Clock
switch
OSC1
oscillation circuit
OSC3
oscillation circuit
Oscillation system
voltage regulator
Operating voltage selection signal
VS1
Divider
Fig. 5.1.1 Oscillation system block diagram
5.2 OSC1 Oscillation Circuit
The OSC1 oscillation circuit generates the main clock for the CPU and the peripheral circuits. Circuit type
is a crystal oscillation circuit.
Figure 5.2.1 shows the configuration of the OSC1 oscillation circuit.
VDD
OSC2
OSC1
X'tal
CGX
To CPU and
peripheral circuit
Rfx
CDX
R
DX
Fig. 5.2.1 OSC1 crystal oscillation circuit
As shown in Figure 5.2.1, the crystal oscillation circuit can be configured simply by connecting the crystal
oscillator (X'tal) of 32.768 kHz (Typ.) and the feedback resistor Rfx (10 M
) between the OSC1 and OSC2
terminals and the trimmer capacitor (CGX) between the OSC1 and VDD terminals.
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