參數(shù)資料
型號: 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
文件頁數(shù): 16/78頁
文件大?。?/td> 874K
代理商: S1C62920D
S1C62920 TECHNICAL MANUAL
EPSON
15
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Oscillation Circuit)
4.3.3 OSC3 oscillation circuit
The OSC3 oscillation circuit generates the system clock to drive the CPU and some peripheral circuits
(serial interface, R/F converter and FOUT output) in high-speed.
Either ceramic oscillation or CR oscillation can be selected by the mask option for the oscillation circuit
type.
Figure 4.3.3.1 is the block diagram of the OSC3 oscillation circuit.
(a) Ceramic oscillation circuit
OSC4
OSC3
Oscillation circuit
control signal
RCR
fOSC3
CCR
VSS
OSC4
OSC3
CDC
CGC
Oscillation circuit
control signal
Ceramic
fOSC3
R
FC
R
DC
(b) CR oscillation circuit
Fig. 4.3.3.1 OSC3 oscillation circuit
When ceramic oscillation is selected, the ceramic oscillation circuit can be configured by connecting the
ceramic oscillator (Max. 1 MHz) between terminals OSC3 and OSC4 to the two capacitors (CGC and CDC)
located between terminals OSC3 and OSC4 and VSS.
When CR oscillation is selected, the CR oscillation circuit can be configured simply by connecting the
resistor (RCR) between terminals OSC3 and OSC4.
4.3.4 CPU clock switching
The CPU system clock can be switched between OSC1 and OSC3 by the software.
When the CPU operates by OSC1, turning the OSC3 oscillation circuit off can save power.
If high-speed operation is required, turn the OSC3 oscillation circuit on and switch the system clock to
OSC3. In this case, switch the clock to OSC3 after 5 msec or more time has elapsed since this time is neces-
sary for stabilizing the oscillation after turning the OSC3 oscillation circuit on. (The oscillation start time
will vary somewhat depending on the oscillator and on the externally attached parts. Refer to the oscilla-
tion start time example indicated in Chapter 7, "ELECTRICAL CHARACTERISTICS".)
When switching from OSC3 to OSC1, turn the OSC3 oscillation circuit off immediately after the clock is
switched to OSC1.
4.3.5 Clock frequency and instruction execution time
Table 4.3.5.1 shows the instruction execution time according to each frequency of the system clock.
Table 4.3.5.1 Clock frequency and instruction execution time
Clock frequency
5-clock instruction
152.6
5.0
OSC1: 32.768 kHz
OSC3: 1 MHz
Instruction execution time (sec)
7-clock instruction
213.6
7.0
12-clock instruction
366.2
12.0
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