Oscillation Circuit Configuration Example; Figure 3.2 Configuration Example Of The Oscillation Circuit - Renesas R-IN32M3 Series User Manual

R-IN32M3 Series: Board design edition
3.3

Oscillation Circuit Configuration Example

The following figure shows typical examples of oscillation circuits.
(1) Resonator input mode
OSCTH
R-IN32M3
XT1
C
1
Resonator
Though Rd is an element to suppress the
excitation current and negative resistance of the
resonator, it may not be required depending on
the resonator to be used.

Figure 3.2 Configuration Example of the Oscillation Circuit

Caution. The input of the R-IN32M3 is fixed to 25 MHz.
When a resonator is to be used, contact the resonator manufacturer and ask for a
corresponding part number and external constants.
Renesas recommends the following oscillator and resonator manufacturers.
• Nihon Dempa Kogyo Co., Ltd. (NDK)
URL: http://www.ndk.com/en/index.html
• KYOCERA Crystal Device Corporation
URL: http://1 www.kyocera-crystal.jp/
R18UZ0021EJ0400
Dec. 28, 2018
XT2
Rd
C
2
(2) External clock input mode
VDD33（3.3V）
OSCTH
R-IN32M3
XT1
In external clock input mode, drive
XT1 to the low level.
3. Clock Input Pins
XT2
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