Renesas RL78 Series User Manual page 838

RL78/G1D
30.3 Oscillator Characteristics
30.3.1 X1, XT1, XRF oscillator characteristics
–
(T = 40 to +85°C, 1.6 V ≤ V
A
Parameter
X1 clock oscillation Ceramic resonator
Note 1
frequency Crystal resonator
XT1 clock oscillation frequency
RF base clock oscillation frequency
RF base clock oscillation frequency
Note 2
accuracy
Notes 1. Indicates only permissible oscillator frequency ranges. Refer to AC Characteristics for instruction execution
time.
Request evaluation by the manufacturer of the oscillator circuit mounted on a board to check the oscillator
characteristics.
2. This Oscillator characteristics is base clock for RF Transceiver.
Caution Since the CPU is started by the high-speed on-chip oscillator clock after a reset release, check the X1
clock oscillation stabilization time using the oscillation stabilization time counter status register
(OSTC) by the user.
Determine the oscillation stabilization time of the OSTC register and the oscillation stabilization time
select register (OSTS) after sufficiently evaluating the oscillation stabilization time with the resonator
to be used.
Remark When using the X1, XT1 oscillators, refer to 6.4 System Clock Oscillator.
R01UH0515EJ0120 Rev.1.20
Dec 16, 2016
= V = AV ≤ 3.6 V, V
DD DD_RF DD_RF
Symbol
f 2.7 V ≤ V
X
1.8 V ≤ V
1.6 V ≤ V
Note 1
f
XT
Note 2
f
XRF
f
XRFP
CHAPTER 30 ELECTRICAL SPECIFICATIONS
= V = AV = 0 V)
SS SS_RF SS_RF
Conditions
≤ 3.6 V
DD
< 2.7 V
DD
≤ 1.8 V
DD
MIN. TYP. MAX. Unit
1 20 MHz
1 8 MHz
1 4 MHz
32 32.768 35 kHz
32 MHz
-20 +20 ppm
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