Renesas RA Family
RA2 Quick Design Guide
R01AN6060EU0100 Rev.1.00
Page 15 of 44
Sep.14.21
Figure 8. Timing of Clock Source Switching
5.5 Clock Setup Example
Renesas FSP provides a simple, visual clock configuration tool for RA2A1 MCU shown as follows. This
configurator configures code in the board support package to initialize the Clock Generation Circuit based on
user selection, with proper precautions as indicated in the MCU hardware user manual.
Figure 9. Clock Settings Using Renesas FSP Configurator
5.6 HOCO Accuracy
The internal high-speed on-chip oscillator (HOCO) runs at 24 MHz, 32 MHz, 48 MHz, or 64 MHz for RA2
devices, with a typical accuracy of +/-2% or better. HOCO accuracy specifications are characterized for
various ambient operating temperature (Ta) ranges. See the “Electrical Characteristics” of the Hardware
User’s Manual for the clock accuracy specifications in the desired temperature range.
The HOCO may be used as an input to the clock generation circuit. When the HOCO is used this way, no
external oscillator is required. This may be an advantage when space constraints or other limitations require
