upd78f0114m6gb-8es Renesas Electronics Corporation., upd78f0114m6gb-8es Datasheet - Page 435

• Manufacturer Part Number: upd78f0114m6gb-8es
• Description: 8-bit Single-chip Microcontrollers
• 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
Ring-OSC Oscillator Characteristics
(T
Ceramic
resonator
Crystal
resonator
External
clock
On-chip Ring-OSC oscillator
Resonator Recommended Circuit
CHAPTER 26 ELECTRICAL SPECIFICATIONS (STANDARD PRODUCTS, (A) GRADE PRODUCTS) (CONVENTIONAL PRODUCTS)
A
A
= −40 to +85°C, 2.7 V ≤ V
= −40 to +85°C, 2.7 V ≤ V
2. Since the CPU is started by the Ring-OSC after reset is released, check the oscillation
Resonator
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.
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
C1
X1
C1
X1
X1
C2
C2
X2
X2
X2
DD
DD
Oscillation frequency (f
= EV
= EV
Oscillation
frequency (f
Oscillation
frequency (f
X1 input
frequency (f
X1 input high-
/low-level width
(t
XPH
Parameter
DD
DD
, t
XPL
≤ 5.5 V, 2.7 V ≤ AV
≤ 5.5 V, 2.7 V ≤ AV
Parameter
)
XP
XP
XP
User’s Manual U16227EJ3V0UD
)
)
)
Note
Note
Note
4.0 V ≤ V
3.3 V ≤ V
2.7 V ≤ 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
4.0 V ≤ V
3.3 V ≤ V
2.7 V ≤ V
R
)
REF
REF
DD
DD
DD
DD
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
≤ 5.5 V
< 4.0 V
< 3.3 V
≤ 5.5 V
< 4.0 V
< 3.3 V
≤ V
≤ V
Conditions
DD
DD
, V
, V
Conditions
SS
SS
= EV
= EV
SS
SS
= AV
= AV
SS
SS
MIN.
120
MIN.
= 0 V)
= 0 V)
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
46
56
96
TYP.
TYP.
240
SS
MAX.
MAX.
480
8.38
8.38
8.38
500
500
500
.
5.0
5.0
5.0
10
10
10
Unit
kHz
MHz
MHz
MHz
Unit
ns
435