Datasheet

RL78/G14 3. ELECTRICAL SPECIFICATIONS (G: TA = -40 to +105 C)
R01DS0053EJ0200 Rev. 2.00 Page 115 of 187
Oct 25, 2013
3.2 Oscillator Characteristics
3.2.1 X1, XT1 characteristics
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 and XT1 oscillator, refer to 5.4 System Clock Oscillator in the RL78/G14 User’s Manual
Hardware
.
3.2.2 On-chip oscillator characteristics
Note 1. High-speed on-chip oscillator frequency is selected with bits 0 to 4 of the option byte (000C2H) and bits 0 to 2 of the
HOCODIV register.
Note 2. This only indicates the oscillator characteristics. Refer to AC Characteristics for instruction execution time.
(TA = -40 to +105 °C, 2.4 V  VDD  5.5 V, VSS = 0 V)
Resonator Resonator Conditions MIN. TYP. MAX. Unit
X1 clock oscillation frequency (f
X)
Note
Ceramic resonator/
crystal resonator
2.7 V
VDD 5.5 V
1.0 20.0 MHz
2.4 V
VDD <2.7 V
1.0 16.0
XT1 clock oscillation frequency (f
XT)
Note
Crystal resonator 32 32.768 35 kHz
(TA = -40 to +105 C, 2.4 V  VDD  5.5 V, VSS = 0 V)
Oscillators Parameters Conditions MIN. TYP. MAX. Unit
High-speed on-chip oscillator clock frequency
Notes 1, 2
fIH 132MHz
High-speed on-chip oscillator clock frequency
accuracy
-20 to +85
C2.4 V  VDD  5.5 V -1.0 +1.0 %
-40 to -20
C2.4 V  VDD  5.5 V -1.5 +1.5 %
+85 to +105
C2.4 V  VDD  5.5 V -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 %