upd78f0148m1gka1-9eu Renesas Electronics Corporation., upd78f0148m1gka1-9eu Datasheet - Page 547

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

X1 Oscillator Characteristics
(T
Notes 1.
Cautions 1. When using the X1 oscillator, wire as follows in the area enclosed by the broken lines in the
CHAPTER 31 ELECTRICAL SPECIFICATIONS (STANDARD PRODUCTS, (A) GRADE PRODUCTS) (CONVENTIONAL PRODUCTS)
Ceramic
resonator
Crystal
resonator
External
clock
Resonator Recommended Circuit
A
= −40 to +85°C, 2.7 V ≤ V
Note 3
2.
3.
2. Since the CPU is started by the internal oscillation clock after reset is released, check the
Indicates only oscillator characteristics. Refer to AC Characteristics for instruction execution time.
When the REGC pin is connected to V
Connect the REGC pin directly to V
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.
V
V
SS
SS
X1
C1
C1
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
XPH
Parameter
DD
, t
XPL
≤ 5.5 V, 2.7 V ≤ AV
)
XP
XP
XP
User’s Manual U15947EJ3V1UD
)
)
)
Note 1
Note 1
Note 1
DD
.
SS
When a capacitor
is connected to
the REGC pin
When the REGC
pin is connected
directly to V
When a capacitor
is connected to
the REGC pin
When the REGC
pin is connected
directly to V
4.0 V ≤ V
3.3 V ≤ V
2.7 V ≤ V
4.0 V ≤ V
3.3 V ≤ V
2.7 V ≤ V
via a capacitor (1
REF
DD
DD
DD
DD
DD
DD
DD
DD
≤ 5.5 V
< 4.0 V
< 3.3 V
≤ 5.5 V
< 4.0 V
< 3.3 V
≤ V
Note 2
Note 2
Conditions
DD
, V
4.0 V ≤ V
4.0 V ≤ V
3.3 V ≤ V
2.7 V ≤ V
4.0 V ≤ V
4.0 V ≤ V
3.3 V ≤ V
2.7 V ≤ V
µ
SS
F: recommended).
= EV
DD
DD
DD
DD
DD
DD
DD
DD
SS
< 5.5 V
≤ 5.5 V
< 4.0 V
< 3.3 V
< 5.5 V
≤ 5.5 V
< 4.0 V
< 3.3 V
= AV
SS
MIN.
= 0 V)
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
46
56
96
TYP.
SS
MAX.
8.38
8.38
8.38
8.38
8.38
500
500
500
.
5.0
5.0
5.0
10
10
10
MHz
MHz
MHz
MHz
MHz
Unit
ns
547