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RH850/U2A 292pin
4. Clock Supply
The device's operation clock can be generated by
•
the on-chip oscillator main oscillator circuit in combination with an off-chip resonator, connected to the X1, X2
terminals
•
an off-chip oscillator, the clock is fed into the X1 terminal
Figure 4.1 Clock supply
4.1
Main Oscillator
For operating the on-chip main oscillator the piggyback board provides a socket (X1) for a resonator.
Optionally a resonator (X3) can be soldered on the board, refer to the figure above.
Several resonators for various main oscillator frequencies (16 MHz, 20 MHz, 24 MHz, 40 MHz) are included in the
board package.
The 40MHz resonator is by default mounted to X1.
For package content please refer to 1.1 Package Components
CAUTION
Only one oscillator, either X1 or X3, can be used at any one time for the main oscillator.
R20UT4545ED0102 Rev.1.02
May 27, 2021
4. Clock Supply
Page 22 of 58
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