RL78/G10 CHAPTER 24 ELECTRICAL SPECIFICATIONS
R01UH0384EJ0311 Rev. 3.11 587
Dec 22, 2016
24.2 Oscillator Characteristics
24.2.1 X1 oscillator characteristics
(TA = −40 to +85°C, 2.0 V ≤ VDD ≤ 5.5 V, VSS = 0 V)
Parameter Resonator Conditions MIN. TYP. MAX. Unit
X1 clock
oscillation
frequency
(f
X)
Note
Ceramic resonator/
crystal resonator
2.7 V ≤ V
DD ≤ 5.5 V 1 20 MHz
2.0 V ≤ VDD < 2.7 V 1 5 MHz
Note 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.
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 oscillator, refer to 5.4 System Clock Oscillator.
24.2.2 On-chip oscillator characteristics
(TA = −40 to +85°C, 2.0 V ≤ VDD ≤ 5.5 V, VSS = 0 V)
Oscillators Parameters Conditions MIN. TYP. MAX. Unit
High-speed on-chip oscillator oscillation
clock frequency
Notes 1, 2
f
IH 1.25 20 MHz
High-speed on-chip oscillator oscillation
clock frequency accuracy
TA = -20 to +85°C -2.0
+2.0
%
TA = -40 to -20°C -3.0
+3.0
%
Low-speed on-chip oscillator oscillation
clock frequency
f
IL 15 kHz
Low-speed on-chip oscillator oscillation
clock frequency accuracy
-15 +15 %
Notes 1. High-speed on-chip oscillator frequency is selected by bits 0 to 2 of option byte (000C2H).
2. This only indicates the oscillator characteristics. Refer to AC Characteristics for instruction execution time.
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