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參數(shù)資料
| 型號(hào)： | S1C60N08F0A0100 |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | MICROCONTROLLER, PQFP100 |
| 封裝： | PLASTIC, QFP-100 |
| 文件頁(yè)數(shù)： | 68/145頁(yè) |
| 文件大?。?/td> | 1118K |
| 代理商： | S1C60N08F0A0100 |
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S1C60N08 TECHNICAL HARDWARE
EPSON
I-17
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Oscillation Circuit and Prescaler)
4.3 Oscillation Circuit and Prescaler
4.3.1 Configuration of oscillation circuit and prescaler
The S1C60N08 and S1C60L08 have one oscillation circuit (OSC1), and the S1C60A08 has two oscillation
circuits (OSC1 and OSC3). OSC1 is a crystal oscillation circuit that supplies the operating clock the CPU
and peripheral circuits. OSC3 is either a CR or ceramic oscillation circuit. When processing with the
S1C60A08 requires high-speed operation, the CPU operating clock can be switched from OSC1 to OSC3.
Figure 4.3.1.1 is the block diagram of this oscillation system.
Oscillation circuit control signal
CPU clock selection signal
Prescaler selection signal
To CPU (and serial interface)
To peripheral circuits
Clock
switch
To peripheral circuits (256 Hz)
OSC3
oscillation
circuit
OSC1
oscillation
circuit
Selector
Prescaler 2
Prescaler 1
Fig. 4.3.1.1 Oscillation system
As Figure 4.3.1.1 indicates, two prescalers (demultiplier stage) are connected to the oscillation circuit.
Prescaler 1 is for 32.768 kHz and prescaler 2 is for 38.4 kHz. These can be selected through the software to
suit the crystal oscillator. This selection invokes the basic signal (256 Hz) for running the clock timer,
stopwatch timer, and so forth.
Also for S1C60A08, selection of either OSC1 or OSC3 for the CPU's operating clock can be made through
the software.
4.3.2 OSC1 oscillation circuit
The S1C60N08 Series has a built-in crystal oscillation circuit (OSC1 oscillation circuit). As an external
element, the OSC1 oscillation circuit generates the operating clock for the CPU and peripheral circuits by
connecting the crystal oscillator (Typ. 32.768 kHz) and trimmer capacitor (5–25 pF).
Figure 4.3.2.1 is the block diagram of the OSC1 oscillation circuit.
VDD
OSC2
OSC1
X'tal
CGX
To CPU and
peripheral circuits
S1C60N08 Series
R
FX
CDX
R
DX
Fig. 4.3.2.1 OSC1 oscillation circuit
As Figure 4.3.2.1 indicates, the crystal oscillation circuit can be configured simply by connecting the
crystal oscillator (X'tal) between terminals OSC1 and OSC2 to the trimmer capacitor (CGX) between
terminals OSC1 and VDD.
Also, the crystal oscillator can be connected to the 38.4 kHz oscillator in addition to the 32.768 kHz
oscillator.
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