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7477 Datasheet(PDF) 266 Page - Renesas Technology Corp

Part # 7477
Description  8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES
PDF  361 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7477 Datasheet(HTML) 266 Page - Renesas Technology Corp

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7470/7471/7477/7478 GROUP USER’S MANUAL
2-40
APPLICATION
7470
7471
7477
7478
2.7 Oscillation circuit
2.7 Oscillation circuit
(1) Oscillation circuit using a ceramic resonator
An oscillation circuit can be formed by connecting a ceramic resonator or a crystal oscillator between
the XIN pin and the XOUT pin and between the XCIN pin and the XCOUT pin.
Figure 2.7.1 shows an example of oscillation circuit using a ceramic resonator.
Regarding such circuit constants as Rd, CIN and COUT, ask the oscillator maker for information and
then set the recommended value.
Fig. 2.7.1 Example of Oscillation circuit using ceramic resonator
(2) External clock input
To the main clock and timer clock oscillation circuits, clocks can also be supplied from the outside.
Figure 2.7.2 shows an example of circuits in this case. At this time, make the XOUT (XCOUT) pin open.
As an external clock to be input to the XIN (XCIN) pin, use a pulse signal with a duty ratio of 50 %.
Fig. 2.7.2 Example of external clock input circuit
Note: The XCIN and the XCOUT pin are not provided in the 7470/7477 group.
CIN
COUT
XIN
XOUT
Rd
CIN
COUT
Rd
7470/7477 group
7471/7478 group
14
15
19
24
20
23
(18)
(25)
(26)
XIN
XOUT
XCIN
XCOUT
Rd'
(19)
CCIN
CCOUT
Note: The number in parentheses denotes the case of a flat package.
VCC
VSS
CIN
COUT
XIN
XOUT
XCOUT
Rd
7470/7477 group
7471/7478 group
14
15
19
20
23
24
(18)
(25)
(26)
XIN
XOUT
XCIN
(19)
VCC
V
Duty ratio 50%
SS
Note: The number in parentheses denotes the case of a flat package.
Open
External oscillation circuit
External oscillation circuit
Open
Duty ratio 50%



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