Clock Supply; Main Oscillator - Renesas RH850 User Manual

RH850/U2A 292pin

4. Clock Supply

The device's operation clock can be generated by
•
the on-chip oscillator main oscillator circuit in combination with an off-chip resonator, connected to the X1, X2
terminals
•
an off-chip oscillator, the clock is fed into the X1 terminal
P3V3
3.3V
R1
1K0
Figure 4.1 Clock supply
4.1

Main Oscillator

For operating the on-chip main oscillator the piggyback board provides a socket (X1) for a
resonator.
Optionally a resonator (X3) can be soldered on the board, refer to the figure above.
Several resonators for various main oscillator frequencies (16 MHz, 20 MHz, 24 MHz,
40 MHz) are included in the board package.
The 40MHz resonator is by default mounted to X1.
For package content please refer to
CAUTION
Only one oscillator, either X1 or X3, can be used at any one time for the main oscillator.
R20UT4970ED0101 Rev.1.01
July 08, 2022
CAUTION!
crystal
DNF/DNB
SG8018CE-20.000000MHz
OSC1
1 3
OE CLK
GND VCC
C16
100n
1.1 Package Components
DNF/DNB
R2
0
DNF/DNB
R3
X1_C
2D3
IN 0
R4
X2_C
2D2
OUT 0
DNF/DNB
4. Clock Supply
X1 E20
F20
DNF/DNB
X3
X2
16MHz
8pF
X1
40.000 MHz + socket
18pF
16 MHz provide additional
20 MHz provide additional
24 MHz provide additional
Page 26 of 67
X1
X2