RL78/G13 CHAPTER 29 ELECTRICAL SPECIFICATIONS
R01UH0146EJ0100 Rev.1.00 982
Sep 22, 2011
Caution The pins mounted depend on the product. Refer to 2.1.1 20-pin products to 2.1.14 128-pin products,
and 2.1.15 Pins for each product (pins other than port pins).
29.3 Oscillator Characteristics
29.3.1 Main system clock oscillator characteristics
(T
A = −40 to +85°C, 1.6 V ≤ EVDD0 = EVDD1 ≤ VDD ≤ 5.5 V, VSS = EVSS0 = EVSS1 = 0 V)
Resonator
Recommended
Circuit
Parameter Conditions MIN. TYP. MAX. Unit
2.7 V ≤ VDD ≤ 5.5 V 1.0 20.0 MHz
1.8 V ≤ VDD < 2.7 V 1.0 8.0 MHz
Ceramic resonator
C1
X2X1
C2
VSS
Rd
X1 clock oscillation
frequency (f
X)
Note
1.6 V ≤ V
DD < 1.8 V 1.0 4.0 MHz
2.7 V ≤ VDD ≤ 5.5 V 1.0 20.0 MHz
1.8 V ≤ VDD < 2.7 V 1.0 8.0 MHz
Crystal resonator
C1
X2X1
C2
VSS
Rd
X1 clock oscillation
frequency (f
X)
Note
1.6 V ≤ V
DD < 1.8 V 1.0 4.0 MHz
Note Indicates only oscillator characteristics. Refer to AC Characteristics for instruction execution time.
Cautions 1. When using the X1 oscillator, wire as follows in the area enclosed by the broken lines in the above
figures to avoid an adverse effect from wiring capacitance.
• Keep the wiring length as short as possible.
• Do not cross the wiring with the other signal lines.
• Do not route the wiring near a signal line through which a high fluctuating current flows.
• Always make the ground point of the oscillator capacitor the same potential as V
SS.
• Do not ground the capacitor to a ground pattern through which a high current flows.
• Do not fetch signals from the oscillator.
2. 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.
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