RH850/F1Kx, RH850/F1K Series Hardware Design Guide
R01AN3841ED0110 Rev. 1.10 Page 70 of 108
August 8, 2019
4. Device Pins
4.1 X1
4.1.1 Direct Clock Supply to X1
A clock waveform from an external clock source can be used as clock supply to the X1 pin of the microcontroller. The
device has to be configured by software (register MOSCM) appropriately for the direct clock input. In this case, set the
MOSCM bit of the MOSCM register to 1 before clock input to X1 pin is applied.
The configuration by software has to be done when the main oscillator is stopped and before the direct clock is supplied
to X1. These conditions have to be considered when the system is designed.
For the electrical characteristics of the X1 clock input signal, please refer to Sections 47A.3.2, Oscillator
Characteristics, 47B.3.2, Oscillator Characteristics or 47C.3.2, Oscillator Characteristics of the RH850/F1KH,
RH850/F1KM Hardware User’s Manual respectively the Section 40.5 Oscillator Characteristics of the RH850/F1K
Hardware User’s Manual.
Figure 28: Direct clock supply to X1 (MOSC)
In order to improve the electromagnetic interference and susceptibility it is recommended to add an external filter
circuit based on the application requirements.
X1
RH850/F1Kx,
RH850/F1K
Exte rn al c lock s ourc e
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