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RL78/G1A CHAPTER 5 CLOCK GENERATOR
R01UH0305EJ0200 Rev.2.00 178
Jul 04, 2013
5.7 Resonator and Oscillator Constants
The resonators for which the operation is verified and their oscillator constants are shown below.
Cautions 1. The oscillator constants shown above are reference values based on evaluation in a specific
environment by the resonator manufacturer. Be sure to apply to the resonator manufacturer for
evaluation on the actual circuit before using these constants for your application.
Also apply to the resonator manufacturer for re-evaluation on the actual circuit if you have changed
the make of the microcontroller or the board.
2. The oscillation voltage and oscillation frequency only indicate the oscillator characteristic. Use the
RL78 microcontroller so that the internal operation conditions are within the specifications of the
DC and AC characteristics.
Figure 5-16. External Oscillation Circuit Example
(a) X1 oscillation
C1
X2X1
C2
VSS
Rd
(b) XT1 oscillation
XT1XT2
C4
C3
Rd
VSS
<R>