UPD78F0138 NEC, UPD78F0138 Datasheet - Page 489

• Manufacturer Part Number: UPD78F0138
• Description: (UPD78xxxx) 8-Bit Single-Chip Microcontrollers
• Manufacturer: NEC

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
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 +110°C
Note 2
2.
3.
Note 2
Note 2
2. Since the CPU is started by the Ring-OSC after reset is released, check the oscillation
themselves or apply to the resonator manufacturer for evaluation.
T
T
Connect the REGC pin directly to V
Indicates only oscillator characteristics. Refer to AC Characteristics for instruction execution time.
A
A
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 status register
(OSTC).
stabilization time select register (OSTS) after sufficiently evaluating the oscillation stabilization
time with the resonator to be used.
Recommended Circuit
= −40 to +110°C:
= −40 to +105°C:
V
V
SS
SS
X1
C1
C1
Note 1
X1
X1
CHAPTER 30 ELECTRICAL SPECIFICATIONS ((A1) GRADE PRODUCTS)
, 3.3 V ≤ V
Determine the oscillation stabilization time of the OSTC register and oscillation
C2
C2
X2
X2
X2
µ
µ
DD
PD780131(A1), 780132(A1), 780133(A1), 780134(A1), 780136(A1), 780138(A1)
PD78F0134(A1), 78F0138(A1)
Oscillation frequency (f
Oscillation frequency (f
X1 input frequency (f
X1 input high-/low-level width
(t
= EV
XPH
, t
XPL
DD
)
≤ 5.5 V, 3.3 V ≤ AV
User’s Manual U16228EJ2V0UD
Parameter
DD
.
XP
)
XP
XP
Note 3
)
)
Note 3
Note 3
REF
4.5 V ≤ V
4.0 V ≤ V
3.3 V ≤ V
4.5 V ≤ V
4.0 V ≤ V
3.3 V ≤ V
4.5 V ≤ V
4.0 V ≤ V
3.3 V ≤ V
4.5 V ≤ V
4.0 V ≤ V
3.3 V ≤ V
≤ V
DD
Conditions
, V
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
SS
≤ 5.5 V
< 4.5 V
< 4.0 V
≤ 5.5 V
< 4.5 V
< 4.0 V
≤ 5.5 V
< 4.5 V
< 4.0 V
≤ 5.5 V
< 4.5 V
< 4.0 V
= EV
SS
= AV
MIN.
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
46
56
96
SS
= 0 V)
TYP.
SS
MAX.
8.38
8.38
8.38
500
500
500
.
5.0
5.0
5.0
10
10
10
MHz
MHz
MHz
Unit
ns
489