Renesas RH850/U2A 144pin, Руководство пользователя

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RH850/U2A 144pin 4. Clock Supply
R20UT5089ED0101 Rev.1.01 Page 14 of 56
July 08, 2022
The available footprint and circuitry is designed for a SG-8018CE programmable crystal
oscillator from Seiko Epson. The output of this oscillator can be connected to X1 terminal via
resistor R2.
The SG-8018CE 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 29 of CN15 to supply an external clock to the device via R3
•
X2: Pin 27 of CN15 for measurement purposes of the clock via R4