R-IN32M4-CL3 User's Manual: Board design edition
3. Clock Input Pins
R18UZ0074EJ0100
Page 9 of 61
Dec 24, 2019
3.3
Configuration Example of Oscillation Circuits
The following figure shows the configuration example of oscillation circuits.
(1) Resonator input mode
(2) External clock input mode
OSCTH
XT1
XT2
Resonator
C
1
C
2
Rd
OSCTH
XT1
XT2
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.
In external clock input mode, drive
XT1 to the low level.
R-IN32M4-CL3
R-IN32M4-CL3
VDD33 (3.3 V)
Figure 3.2 Configuration Example of the Oscillation Circuit
Caution:
The input of the R-IN32M4-CL3 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/