Renesas rl78 User Manual
RL78/G1A
CHAPTER 29 ELECTRICAL SPECIFICATIONS (T
A
=
−40 to +85°C)
R01UH0305EJ0200 Rev.2.00
853
Jul 04, 2013
29.2 Oscillator Characteristics
29.2.1 X1, XT1 oscillator characteristics
(T
A
=
−40 to +85°C, 1.6 V ≤ V
DD
≤ 3.6 V, V
SS
= 0 V)
Parameter Resonator
Conditions
MIN.
TYP.
MAX.
Unit
2.7 V
≤ V
DD
≤ 3.6 V
1.0
20.0
MHz
2.4 V
≤ V
DD
< 2.7 V
1.0
16.0
MHz
1.8 V
≤ V
DD
< 2.4 V
1.0
8.0
MHz
X1 clock oscillation
frequency (f
X
)
Note
Ceramic resonator/crystal resonator
1.6 V
≤ V
DD
< 1.8 V
1.0
4.0
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.
29.2.2 On-chip oscillator characteristics
(T
A
=
−40 to +85°C, 1.6 V ≤ V
DD
≤ 3.6 V, V
SS
= 0 V)
Oscillators Parameters
Conditions
MIN.
TYP.
MAX.
Unit
High-speed on-chip oscillator
clock frequency
Notes 1, 2
f
IH
1
32
MHz
1.8 V
≤ V
DD
≤ 3.6 V
−1.0 +1.0
%
−20 to +85 °C
1.6 V
≤ V
DD
< 1.8 V
−5.0 +5.0
%
1.8 V
≤ V
DD
≤ 3.6 V
−1.5 +1.5
%
High-speed on-chip oscillator
clock frequency accuracy
−40 to −20 °C
1.6 V
≤ V
DD
< 1.8 V
−5.5 +5.5
%
Low-speed on-chip oscillator
clock frequency
f
IL
15
kHz
Low-speed on-chip oscillator
clock 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.
<R>
<R>