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RH850/U2A 292pin
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
R20UT4545ED0102 Rev.1.02
May 27, 2021
4. Clock Supply
Page 23 of 58
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