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RL78/G1A
CHAPTER 30 ELECTRICAL SPECIFICATIONS (G: INDUSTRIAL APPLICATIONS T
A
=
−
40 to +105
°
C)
R01UH0305EJ0200 Rev.2.00 909
Jul 04, 2013
30.2 Oscillator Characteristics
30.2.1 X1, XT1 oscillator characteristics
(T
A = −40 to +105°C, 2.4 V ≤ VDD ≤ 3.6 V, VSS = 0 V)
Parameter Resonator Conditions MIN. TYP. MAX. Unit
2.7 V ≤ VDD ≤ 3.6 V 1.0 20.0
X1 clock oscillation
frequency (f
X)
Note
Ceramic resonator/crystal resonator
2.4 V ≤ V
DD < 2.7 V 1.0 16.0
MHz
XT1 clock oscillation
frequency (f
X)
Note
Crystal resonator 32 32.768 35 kHz
Note Indicates only permissible oscillator frequency ranges. See 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 and XT1 oscillator, see 5.4 System Clock Oscillator.
30.2.2 On-chip oscillator characteristics
(TA = −40 to +105°C, 2.4 V ≤ VDD ≤ 3.6 V, VSS = 0 V)
Oscillators Parameters Conditions MIN. TYP. MAX. Unit
High-speed on-chip oscillator
oscillation frequency
Notes 1, 2
f
IH 1 32 MHz
+85 to +105 °C 2.4 V ≤ VDD ≤ 3.6 V −2 +2 %
−20 to +85 °C 2.4 V ≤ VDD ≤ 3.6 V −1 +1 %
High-speed on-chip oscillator
oscillation frequency accuracy
−40 to −20 °C 2.4 V ≤ V
DD ≤ 3.6 V −1.5 +1.5 %
Low-speed on-chip oscillator
oscillation frequency
f
IL 15 kHz
Low-speed on-chip oscillator
oscillation frequency accuracy
−15 +15 %
Notes 1. High-speed on-chip oscillator frequency is selected by bits 0 to 3 of option byte (000C2H/010C2H) and bits 0
to 2 of HOCODIV register.
2. This indicates the oscillator characteristics only. See AC Characteristics for instruction execution time.
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