參數(shù)資料
型號： S1C88848D0A0100
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 8.2 MHz, MICROCONTROLLER, UUC192
封裝： DIE-192
文件頁數(shù)： 103/174頁
文件大?。?/td> 1304K
代理商： S1C88848D0A0100
26
EPSON
S1C88848 TECHNICAL MANUAL
5 PERIPHERAL CIRCUITS AND THEIR OPERATION (Oscillation Circuits)
5.3 Oscillation Circuits
5.3.1 Configuration of oscillation circuits
The S1C88848 is twin clock system with two
internal oscillation circuits (OSC1 and OSC3).
The OSC3 oscillation circuit generates the main
clock when the CPU and some peripheral circuits
(output port, serial interface, programmable timer
and remote controller) are in high speed operation.
The OSC1 oscillation circuit generates the 32.768
kHz (Typ.) sub-clock.
Figure 5.3.1.1 shows the configuration of the
oscillation circuit.
To CPU (CLK)
OSC1
oscillation circuit
Clock
switch
OSC3
oscillation circuit
To peripheral
circuit (fOSC1)
OSCC
Oscillation circuit
control signal
CLKCHG
CPU clock
selection signal
To some peripheral
circuit (fOSC3)
SLEEP
status
Fig. 5.3.1.1 Configuration of oscillation circuits
At initial reset, OSC3 oscillation circuit is selected
for the CPU operating clock. Switching the system
clock between OSC1 and OSC3 and turning the
OSC3 oscillation circuit ON and OFF are controlled
by software. OSC3 circuit is utilized when high
speed operation of the CPU and some peripheral
circuits become necessary. Otherwise, OSC1 should
be used to generate the operating clock and OSC3
circuit placed in a stopped state in order to reduce
current consumption.
5.3.2 Mask option
OSC1 oscillation circuit
■
■ Crystal oscillation circuit
■
■ CR oscillation circuit
OSC3 oscillation circuit
■
■ Crystal oscillation circuit
■
■ Ceramic oscillation circuit
■
■ CR oscillation circuit
In terms of the oscillation circuit types for OSC1,
either crystal oscillation or CR oscillation can be
selected by mask option.
In terms of oscillation circuit types for OSC3, either
crystal oscillation, ceramic oscillation or CR
oscillation can be selected bymask option, in the
same way as OSC1.
5.3.3 OSC1 oscillation circuit
The OSC1 oscillation circuit generates the 32.768 kHz
(Typ.) system clock which is utilized during low
speed operation (low power mode) of the CPU and
peripheral circuits. Furthermore, even when OSC3 is
utilized as the system clock, OSC1 continues to
generate the source clock for the clock timer and
stopwatch timer.
This oscillation circuit stops when the SLP instruc-
tion is executed.
In terms of the oscillation circuit types, either
crystal oscillation or CR oscillation can be selected
by mask option.
Figure 5.3.3.1 shows the configuration of the OSC1
oscillation circuit.
fOSC1
VSS
OSC2
OSC1
X'tal1
CG1
SLEEP status
(1) Crystal oscillation circuit
OSC2
OSC1
RCR1
fOSC1
SLEEP status
(2) CR oscillation circuit
Fig. 5.3.3.1 OSC1 oscillation circuit
When crystal oscillation is selected, a crystal
oscillation circuit can be easily formed by connect-
ing a crystal oscillator X'tal1 (Typ. 32.768 kHz)
between the OSC1 and OSC2 terminals along with
a trimmer capacitor CG1 (5–25 pF) between the
OSC1 terminal and VSS.
When CR oscillation is selected, connect a resistor
(RCR1) between the OSC1 and OSC2 terminals.
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