Configuration Example Of Oscillation Circuits - Renesas R-IN32M4-CL2 User Manual

R-IN32M4-CL2 User's Manual: Board design edition
3.3

Configuration Example of Oscillation Circuits

The following figure shows the configuration example of oscillation circuits.
(1) Resonator input mode
OSCTH
R-IN32M4-CL2
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-IN32M4-CL2 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)
http://www.ndk.com/en/index.html
• KYOCERA Crystal Device Corporation
https://global.kyocera.com/prdct/electro/product/crystal-device/
R18UZ0046EJ0200
Dec. 28, 2018
XT2
Rd
C
2
(2) External clock input mode
VDD33 (3.3 V)
OSCTH
R-IN32M4-CL2
XT1
In external clock input mode, drive
XT1 to the low level.
3. Clock Input Pins
XT2
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