參數(shù)資料
型號(hào)： S1C62920D
元件分類： 微控制器/微處理器
英文描述： 4-BIT, MROM, 1.3 MHz, MICROCONTROLLER, UUC63
封裝： DIE-63
文件頁(yè)數(shù)： 15/78頁(yè)
文件大小： 874K
代理商： S1C62920D
14
EPSON
S1C62920 TECHNICAL MANUAL
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Oscillation Circuit)
4.3 Oscillation Circuit
4.3.1 Configuration of oscillation circuit
The S1C62920 has two oscillation circuits (OSC1 and OSC3). The OSC1 oscillation circuit generates main
clock of 32.768 kHz (Typ.). The OSC3 oscillation circuit generates sub-clock to drive the CPU and some
peripheral circuits (serial interface, R/F converter and FOUT output) in high-speed.
Figure 4.3.1.1 is the block diagram of this oscillation system.
To CPU (CLK)
OSC1
oscillation circuit
Clock
switch
OSC3
oscillation circuit
To peripheral circuits (fOSC1)
OSCC
Oscillation circuit
control signal
CLKCHG
CPU clock
selection signal
To some peripheral circuits (fOSC3)
Fig. 4.3.1.1 Oscillation system
At initial reset, the OSC1 oscillation circuit is selected for the CPU operating clock and the OSC3 oscillation
circuit is in stop status.
Turning the OSC3 oscillation circuit on and off and switching the system clock (OSC1
OSC3) can be
controlled by the software. The OSC3 oscillation circuit should be used when the CPU and some peripheral
circuits need high-speed operation. If it is not necessary, stop the OSC3 oscillation and use OSC1 as the
operating clock to reduce current consumption.
4.3.2 OSC1 oscillation circuit
The OSC1 oscillation circuit generates 32.768 kHz (Typ.) system clock.
The OSC1 oscillation clock is used as the system clock when the CPU and the peripheral circuits operate in
low-speed (low current consumption). Furthermore, even when OSC3 is used as the system clock, it is still
used as the clock source for the clock timer and the watchdog timer.
Figure 4.3.2.1 is the block diagram of the OSC1 oscillation circuit.
VSS
OSC2
OSC1
X'tal
CGX
fOSC1
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 (Typ. 32.768 kHz) between terminals OSC1 and OSC2 to the trimmer capacitor CGX (5–25
pF) between terminals OSC1 and VSS.
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