Renesas RH850 Series, User Manual

Page: 27 / 67

RH850/U2A 292pin 4. Clock Supply
R20UT4970ED0101 Rev.1.01 Page 27 of 67
July 08, 2022
4.2 Programmable Oscillator
Instead of using the on-chip main oscillator a programmable crystal oscillator (OSC1) circuit
can be soldered on the board.
The available footprint and circuitry is designed for a SG-8002CE programmable crystal
oscillator from Epson Toyocom. The output of this oscillator can be connected to X1 terminal
via resistor R2.
The SG-8002CE is neither mounted on nor provided with the board. For details about the
available circuitry, refer to
Figure 4.1 Clock supply
.
CAUTION
A resonator mounted on socket X1 or soldered on X3 must not be used in parallel to another clock
source.
4.3 X1 and X2 on CN15
To minimize disturbance on the resonator signal the signals X1 and X2 are by default not
connected to a pin header. If needed the signals can be connected to CN15 via 0 Ω resistors:
•
X1: Pin 40 of CN15 to supply an external clock to the device via R3
•
X2: Pin 39 of CN15 for measurement purposes of the clock via R4