參數(shù)資料
型號： M34551E8-XXXFP
元件分類： 微控制器/微處理器
英文描述： 4-BIT, OTPROM, MICROCONTROLLER, PQFP48
封裝： 7 X 10 MM, 0.65 MM PITCH, PLASTIC, QFP-48
文件頁數(shù)： 32/154頁
文件大小： 1778K
代理商： M34551E8-XXXFP
APPLICATION
2-50
4551 Group User’s Manual
2.8 Oscillation circuit
The 4551 Group has an internal oscillation circuit to produce the clock required for microcomputer operation.
The clock signal f(XIN) is obtained by connecting a ceramic resonator to XIN pin and XOUT pin. The clock
signal f(XCIN) is obtained by connecting a quartz-crystal oscillator to X CIN pin and XCOUT pin.
2.8.1 Oscillation circuit
(1)
f(XIN) clock generating circuit
The clock signal f(XIN) is obtained by connecting a ceramic resonator externally.
Connect this external circuit to pins XIN and XOUT at the shortest distance. A feed-back resistor is
built-in between XIN pin and XOUT pin.
Figure 2.8.1 shows an example of an oscillation circuit connecting a ceramic resonator externally.
Keep the maximum value of oscillation frequency within the range listed Table 2.8.1.
(2)
f(XCIN) clock generating circuit
The clock signal f(XCIN) is obtained by connecting a quartz-crystal externally.
Connect this external circuit to pins XCIN and XCOUT at the shortest distance. A feed-back resistor
is built-in between XCIN pin and XCOUT pin.
Figure 2.8.2 shows an example of an oscillation circuit connecting a quartz-crystal externally.
Fig. 2.8.2 Oscillation circuit example connecting
quartz-crystal externally
Supply voltage
4.5 V to 5.5 V
2.2 V to 5.5 V (Note)
2.5 V to 5.5 V (Note)
(System clock)
(f(XIN)/4)
(f(XIN))
(f(XIN)/4)
(f(XIN))
Oscillation
frequency
8.0 MHz
2.0 MHz
4.0 MHz
1.0 MHz
Note: 2.5 V to 5.5 V for the One Timer PROM version.
Table 2.8.1 Maximum value of oscillation frequency
and supply voltage
Fig. 2.8.1 Oscillation circuit example connecting
ceramic resonator externally
M34551
XIN
XOUT
Rd
CIN
COUT
M34551
XCIN
XCOUT
Rd
CIN
COUT
Note: Externally connect a
damping resistor Rd de-
pending on the oscilla-
tion frequency. (A feed-
back resistor is built-in.)
Use
the
resonator
manufacturer’s recom-
mended value because
constants such as ca-
pacitance depend on the
resonator.
Note: Externally connect a
damping resistor Rd de-
pending on the oscilla-
tion frequency. (A feed-
back resistor is built-in.)
Use the quartz-crystal
oscillator manufacturer’s
recommended value be-
cause constants such as
capacitance depend on
the oscillator.
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