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M30245 Datasheet(PDF) 39 Page - Renesas Technology Corp

Part # M30245
Description  SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
PDF  266 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

M30245 Datasheet(HTML) 39 Page - Renesas Technology Corp

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M30245 Group
System Clock
Rev.2.00
Oct 16, 2006
page 39 of 264
REJ03B0005-0200
Figure 1.19 shows some examples of the main clock circuit, one using an oscillator connected to the circuit, and the
other one using an externally derived clock for input. Figure 1.20 shows some examples of subclock circuits, one using
an oscillator connected to the circuit, and the other one using an externally derived clock for input. Circuit constants in
Figure 1.19 and Figure 1.20 vary with each oscillator used. Use the values recommended by the manufacturer of your
oscillator.
Figure 1.19. Examples of main clock
Figure 1.20. Examples of sub-clock
Microcomputer
Externally derived clock
Open
Vcc
Vss
Microcomputer
(Built-in feedback resistor)
Rd
CIN
COUT
(Note)
Note: Insert a damping resistor if required. The resistance will vary depending on the oscillator and the oscillation drive
capacity setting. Use the value recommended by the maker of the oscillator.
When the oscillation drive capacity is set to low, check that oscillation is stable.
XIN
XOUT
XIN
XOUT
Microcomputer
Externally derived clock
Open
Vcc (Note 2)
Vss
Note 1: Insert a damping resistor if required. The resistance will vary depending on the oscillator and the oscillation drive
capacity setting. Use the value recommended by the maker of the oscillator.
When the oscillation drive capacity is set to low, check that oscillation is stable. Also, if the oscillator manufacturer's
data sheet specifies that a feedback resistor be added external to the chip, insert a feedback resistor between XCIN
and XCOUT following their instructions.
Microcomputer
(Built-in feedback resistor)
Rcd
(Note 1)
Note 2: Reference XCIN to Vcc supply.
XCIN
XCOUT
XCIN
XCOUT
CCIN
CCOUT



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