RL78/G15 CHAPTER 23 ELECTRICAL SPECIFICATIONS (T
A
= −40 to +85°C)
R01UH0959EJ0110 Rev.1.10 Page 711 of 765
Mar 7, 2023
23.2 Oscillator Characteristics
23.2.1 X1 oscillator characteristics
[T
A
= −40 to +85°C, 2.4 V ≤ V
DD
≤ 5.5 V, V
SS
= 0 V]
Item Resonator Condition MIN. TYP. MAX. Unit
X1 clock oscillation frequency (fx)
Note 1
Ceramic resonator/
crystal resonator
2.4 V ≤ V
DD
≤ 5.5 V 1 12 MHz
Note 1. Indicates only permissible oscillator frequency ranges. Refer to 23.4 AC Characteristics for instruction
execution time. For actual applications, request evaluation by the manufacturer of the oscillator circuit
mounted on a board so you can use appropriate values.
Caution Since the CPU is started by the high-speed on-chip oscillator clock after release from the reset state,
the user should use the oscillation stabilization time counter status register (OSTC) to check the X1
clock oscillation stabilization time. Specify the values for the oscillation stabilization time in the OSTC
register and the oscillation stabilization time select register (OSTS) after having sufficiently evaluated
the oscillation stabilization time with the resonator to be used.
Remark When using the X1 oscillator, refer to 5.4 System Clock Oscillator.
23.2.2 On-chip oscillator characteristics
[T
A
= −40 to +85°C, 2.4 V ≤ V
DD
≤ 5.5 V, V
SS
= 0 V]
Item Symbol Condition MIN. TYP. MAX. Unit
High-speed on-chip oscillator clock
frequency
Note 1, Note 2
f
IH
1 16 MHz
High-speed on-chip oscillator clock
frequency accuracy
T
A
= −40 to +85°C −2.0 +2.0 %
Low-speed on-chip oscillator clock
frequency
f
IL
15 kHz
Low-speed on-chip oscillator clock
frequency accuracy
−15 +15 %
Note 1. The high-speed on-chip oscillator frequency is selected by bits 0 to 2 of option byte (00C2H).
Note 2. The listed values only indicate the characteristics of the oscillators. Refer to 23.4 AC Characteristics for
instruction execution time.
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