upd78f0148m1gka1-9eu Renesas Electronics Corporation., upd78f0148m1gka1-9eu Datasheet - Page 593

• Manufacturer Part Number: upd78f0148m1gka1-9eu
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

X1 Oscillator Characteristics
(T
Notes 1. 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, users are required to either evaluate the oscillation
Ceramic
resonator
Crystal
resonator
External
clock
A
Resonator
= −40 to +125°C, 3.3 V ≤ V
Note 2
2. Connect the REGC pin directly to V
Note 2
Note 2
2. Since the CPU is started by the internal oscillation clock after reset is released, check the
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.
oscillation stabilization time of the X1 input clock using the oscillation stabilization time counter
status register (OSTC). 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.
Recommended Circuit
V
V
SS
SS
X1
C1
C1
CHAPTER 33 ELECTRICAL SPECIFICATIONS ((A2) GRADE PRODUCTS)
X1
X1
C2
C2
X2
X2
X2
DD
= EV
Oscillation frequency
(f
Oscillation frequency
(f
X1 input frequency
(f
X1 input high-/low-
level width (t
DD
XP
XP
XP
)
)
)
Note 1
Note 1
Note 1
≤ 5.5 V, 3.3 V ≤ AV
Parameter
User’s Manual U15947EJ3V1UD
DD
.
XPH
, t
XPL
)
4.0 V ≤ V
3.3 V ≤ V
4.0 V ≤ V
3.3 V ≤ V
4.0 V ≤ V
3.3 V ≤ V
4.0 V ≤ V
3.3 V ≤ V
REF
≤ V
DD
DD
DD
DD
DD
DD
DD
DD
DD
Conditions
, V
≤ 5.5 V
< 4.0 V
≤ 5.5 V
< 4.0 V
≤ 5.5 V
< 4.0 V
≤ 5.5 V
< 4.0 V
SS
= EV
SS
= AV
SS
MIN.
2.0
2.0
2.0
2.0
2.0
2.0
56
96
= 0 V)
TYP.
SS
MAX.
8.38
8.38
8.38
500
500
.
5.0
5.0
5.0
MHz
MHz
MHz
Unit
ns
593