Datasheet

RL78/L12
CHAPTER 31 ELECTRICAL SPECIFICATIONS (G: TA = -40 to +105°C)
R01UH0330EJ0200 Rev.2.00 917
Dec 13, 2013
31.2 Oscillator Characteristics
31.2.1 X1, XT1 oscillator characteristics
(T
A = −40 to +105°C, 2.4 V ≤ EVDD = VDD ≤ 5.5 V, VSS = EVSS = 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 1.0 20.0 MHz
2.4 V ≤ VDD < 2.7 V 1.0 16.0 MHz
XT1 clock oscillation
frequency (f
XT)
Note
Crystal resonator 32 32.768 35 kHz
Note Indicates only permissible oscillator frequency ranges. Refer to 31.4 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, refer to 5.4 System Clock Oscillator.