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参数资料
| 型号： | M37544G2SP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PDIP32 |
| 封装： | 0.400 INCH, 1.78 MM PITCH, PLASTIC, SDIP-32 |
| 文件页数： | 29/68页 |
| 文件大小： | 738K |
| 代理商： | M37544G2SP |
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7544 Group
Rev.1.04
2004.06.08
page 35 of 66
REJ03B0012-0104Z
Fig. 41 External circuit of ceramic resonator and quartz-crystal
oscillator
Fig. 43 External clock input circuit
Fig. 40 Processing of XIN and XOUT pins at on-chip oscillator opera-
tion
Clock Generating Circuit
An oscillation circuit can be formed by connecting a resonator be-
tween XIN and XOUT, and an RC oscillation circuit can be formed
by connecting a resistor and a capacitor.
Use the circuit constants in accordance with the resonator
manufacturer's recommended values.
(1) On-chip oscillator operation
When the MCU operates by the on-chip oscillator for the main
clock, connect XIN pin to VCC and leave XOUT pin open.
The clock frequency of the on-chip oscillator depends on the sup-
ply voltage and the operation temperature range.
Be careful that variable frequencies when designing application
products.
(2) Ceramic resonator and quartz-crystal oscillator
When the ceramic resonator and quartz-crystal oscillator is used
for the main clock, connect the ceramic/quartz-crystal oscillator
and the external circuit to pins XIN and XOUT at the shortest dis-
tance. A feedback resistor is built in between pins XIN and XOUT.
(3) RC oscillation
When the RC oscillation is used for the main clock, connect the
XIN pin and XOUT pin to the external circuit of resistor R and the
capacitor C at the shortest distance.
The frequency is affected by a capacitor, a resistor and a micro-
computer.
So, set the constants within the range of the frequency limits.
(4) External clock
When the external signal clock is used for the main clock, connect
the XIN pin to the clock source and leave XOUT pin open.
Externally connect a
damping resistor Rd
depending on the oscil-
lation frequency.
(A feedback resistor is
built-in.)
Use the resonator
manufacturer’s recom-
mended value because
constants such as ca-
pacitance depend on
the resonator.
Note:
Connect the external
circuit of resistor R
and the capacitor C at
the shortest distance.
The frequency is af-
fected by a capacitor,
a resistor and a micro-
computer.
So, set the constants
within the range of the
frequency limits.
Note:
The clock frequency of the
on-chip oscillator depends
on the supply voltage and
the operation temperature
range.
Be careful that variable fre-
quencies and obtain the
sufficient margin.
Note:
XIN
XOUT
M37544
Open
XIN
COUT
CIN
XOUT
M37544
Rd
XIN
XOUT
C
R
M37544
XIN
XOUT
External oscillation
circuit
VCC
VSS
Open
M37544
Fig. 42 External circuit of RC oscillation
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