參數(shù)資料
型號(hào): S1C88832F0A0100
元件分類: 微控制器/微處理器
英文描述: MICROCONTROLLER, PQFP128
封裝: PLASTIC, QFP-128
文件頁數(shù): 91/160頁
文件大?。?/td> 1244K
代理商: S1C88832F0A0100
28
EPSON
S1C88832/88862 TECHNICAL MANUAL
5 PERIPHERAL CIRCUITS AND THEIR OPERATION (Oscillation Circuits and Operating Mode)
5.3 Oscillation Circuits and
Operating Mode
5.3.1 Configuration of oscillation circuits
The S1C88832/88862 is twin clock system with two
internal oscillation circuits (OSC1 and OSC3).
OSC1 oscillation circuit generates the 32.768 kHz
(Typ.) main clock and OSC3 oscillation circuit the
sub-clock when the CPU and some peripheral
circuits (output port, serial interface and program-
mable timer) are in high speed operation.
Figure 5.3.1.1 shows the configuration of the
oscillation circuit.
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. However, in case the SVD circuit is
executing an SLP instruction, oscillation is stopped
in synchronization with the completion of sampling.
In terms of the oscillation circuit types, either
crystal oscillation, CR oscillation, crystal oscillation
(gate capacitor built-in) or external clock input can
be selected with the mask option.
Figure 5.3.3.1 shows the configuration of the OSC1
oscillation circuit.
Fig. 5.3.1.1 Configuration of oscillation circuits
At initial reset, OSC1 oscillation circuit is selected
for the CPU operating clock and OSC3 oscillation
circuit is in a stopped state. ON/OFF switching of
the OSC3 oscillation circuit and switching of the
system clock between OSC1 and OSC3 are control-
led in 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
s
s Crystal oscillation circuit
s
s External clock input
s
s CR oscillation circuit
s
s Crystal oscillation circuit (gate capacitor built-in)
OSC3 oscillation circuit
s
s Crystal oscillation circuit
s
s Ceramic oscillation circuit
s
s CR oscillation circuit
s
s External clock input
In terms of the oscillation circuit types for OSC1,
either crystal oscillation, CR oscillation, crystal
oscillation (gate capacitor built-in) or external clock
input can be selected with the mask option.
In terms of oscillation circuit types for OSC3, either
crystal oscillation, ceramic oscillation, CR oscilla-
tion or external clock input can be selected with the
mask option, in the same way as OSC1.
(3) CR 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
OSC2
OSC1
RCR1
fOSC1
SLEEP status
VSS
OSC2
OSC1
SLEEP status
fOSC1
X'tal1
VSS
fOSC1
VSS
OSC2
OSC1
X'tal1
CG1
SLEEP status
fOSC1
VSS
SLEEP status
OSC2
OSC1
External
clock
N.C.
VSS
VDD
(1) Crystal oscillation circuit
(2) External clock input
(4) Crystal oscillation circuit (gate capacitor built-in)
Fig. 5.3.3.1 OSC1 oscillation circuit
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