Renesas RA Microcontrollers EK-RA4M1 v1 – User's Manual
R20UT4579EU0100 Rev.1.00 Page 26 of 32
Oct.02.19
5.6.2 On-Board Clock Crystals
The EK-RA4M1 board includes two precision crystal clock sources. A
precision 12.000 MHz crystal is installed at location X1, and a precision
32.768 kHz crystal is installed at location X2. These crystal clock sources are
connected to the Main MCU by default.
The MCU pins for the 12 MHz clock crystal may be connected to P212 and
P213. To disconnect the 12 MHz crystal, open copper jumpers E23 and E24,
and close copper jumpers E18 and E19.
The MCU pins for the 32.768 kHz clock crystal may be connected to P214 and P215. To disconnect the
32.768 kHz crystal, open copper jumpers E25 and E26, and close copper jumpers E22 and E27.
Figure 25. Crystal Clock Sources
5.6.3 User Potentiometer
A footprint for installation of a potentiometer and a recommended noise-bypass capacitor
are provided on the board. The footprint was designed for installation of a Bourns P/N
3352T-1-103LF, or equivalent, as the potentiometer, and a Samsung P/N
CL10B104KB8NNNC, or similar, as the noise-bypass capacitor.
When the User Potentiometer is installed, copper jumper E36 must be closed to connect the User
Potentiometer to the MCU.
Table 16. User Potentiometer on the Evaluation Kit Board
Figure 26. User Potentiometer Circuit
To Next Page
Loading...
Need help?
General
