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7721 bảng dữ liệu(PDF) 79 Page - Renesas Technology Corp

tên linh kiện 7721
Giải thích chi tiết về linh kiện  16-BIT SINGLE-CHIP MICROCOMPUTER
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CLOCK GENERATING CIRCUIT
7721 Group User’s Manual
5–2
5.1 Oscillation circuit examples
To the oscillation circuit, a ceramic resonator or a quartz-crystal oscillator can be connected, or the clock
which is externally generated can be input. Oscillation circuit examples are shown below.
5.1.1 Connection example using resonator/oscillator
Figure 5.1.1 shows an example when connecting a ceramic resonator/quartz-crystal oscillator between pins
XIN and XOUT.
The circuit constants such as Rf, Rd, CIN, and COUT (shown in “Figure 5.1.1”) depend on the resonator/
oscillator. These values shall be set to the values
recommended
by
the
resonator/oscillator
manufacturer.
5.1.2 Externally generated clock input example
Figure 5.1.2 shows an input example of the clock
which is externally generated. The external clock
must be input from the XIN pin, and the XOUT pin
must be left open.
5.1 Oscillation circuit examples
Fig. 5.1.1 Connection example using resonator/oscillator
Fig. 5.1.2 Externally generated clock input example
M37721
XIN
XOUT
Rf
CIN
COUT
Rd
M37721
XIN
XOUT
Vcc
Vss
Externally generated clock
Open



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