upd78f0730 Renesas Electronics Corporation., upd78f0730 Datasheet - Page 488

• Manufacturer Part Number: upd78f0730
• Description: 8-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

X1 Oscillator Characteristics
(T
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
Remark For the resonator selection and oscillator constant, customers are requested to either evaluate the
488
Ceramic
resonator
Crystal
resonator
Resonator Recommended Circuit
A
= −40 to +85°C, 4.0 V ≤ V
2. Since the CPU is started by the internal high-speed oscillation clock after a reset release, check
oscillation themselves or apply to the resonator manufacturer for evaluation.
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
• Do not ground the capacitor to a ground pattern through which a high current flows.
• Do not fetch signals from the oscillator.
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.
In addition, make sure that V
V
V
SS
SS
C1
C1
X1
X1
C2
C2
X2
X2
DD
CHAPTER 22 ELECTRICAL SPECIFICATIONS (TARGET)
= EV
X1 clock
oscillation
frequency (f
X1 clock
oscillation
frequency (f
Parameter
DD
≤ 5.5 V, V
Preliminary User’s Manual U19014EJ1V0UD
X
X
DD
)
)
Note
Note
≥ 4.0 V before switching the CPU clock to the X1 clock.
SS
4.0 V ≤ V
4.0 V ≤ V
= EV
SS
DD
DD
= 0 V)
≤ 5.5 V
≤ 5.5 V
Conditions
MIN.
TYP.
SS
MAX.
16.0
16.0
.
MHz
MHz
Unit