UPD78F0411GA-GAM-AX Datasheet, PDF (545/564 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

CHAPTER 27 ELECTRICAL SPECIFICATIONS (STANDARD PRODUCTS)
X1 Oscillator Characteristics
(TA = −40 to +85°C, 1.8 V ≤ VDD ≤ 5.5 V, VSS = AVSS = 0 V)
Standard products
Resonator Recommended Circuit Parameter
Ceramic
resonator
VSS X1 X2
X1 clock
oscillation
frequency (fX)^Note
Conditions
2.7 V ≤ VDD ≤ 5.5 V
C1 C2
1.8 V ≤ VDD < 2.7 V
MIN.
2.0
TYP. MAX.
10.0
Unit
MHz
2.0
5.0
Crystal
resonator
VSS X1 X2
C1 C2
X1 clock
oscillation
frequency (fX)^Note
2.7 V ≤ VDD ≤ 5.5 V
1.8 V ≤ VDD < 2.7 V
2.0
10.0 MHz
2.0
5.0
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 VSS.
• 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 internal high-speed oscillation 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 oscillation stabilization time select register (OSTS) after sufficiently evaluating the
oscillation stabilization time with the resonator to be used.
Remark For the resonator selection and oscillator constant, customers are requested to either evaluate the
oscillation themselves or apply to the resonator manufacturer for evaluation.
User’s Manual U18698EJ1V0UD
543