UPD78F9177 NEC, UPD78F9177 Datasheet - Page 28

• Manufacturer Part Number: UPD78F9177
• Description: 8-BIT SINGLE-CHIP MICROCONTROLLER
• Manufacturer: NEC

Main System Clock Oscillator Characteristics (T
28
Ceramic
resonator
Crystal
resonator
External
clock
Resonator
Notes 1. Indicates only oscillator characteristics. Refer to AC Characteristics for instruction execution time.
Cautions 1. When using the main system clock oscillator, wire as follows in the area enclosed by the
Remark
2. Time required to stabilize oscillation after reset or STOP mode release. Use a resonator that stabilizes
Recommended Circuit
For the resonator selection and oscillator constant, customers are requested to either evaluate the
oscillation themselves or apply to the resonator manufacturer for evaluation.
oscillation within the oscillation wait time.
2. When the main system clock is stopped and the device is operating on the subsystem clock,
X1
V
V
X1
broken lines in the above figures to avoid an adverse effect from wiring capacitance.
PP
PP
wait until the oscillation stabilization time has been secured by the program before
switching back to the main system clock.
C1
C1
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.
X1
X1
C2
C2
OPEN
X2
X2
X2
X2
Oscillation frequency (f
Oscillation stabilization time
Oscillation frequency (f
Oscillation stabilization time
X1 input frequency (f
X1 input high-/low-level width
(t
X1 input frequency (f
X1 input high-/low-level width
(t
XH
XH
, t
, t
XL
XL
)
)
Parameter
Data Sheet U14022EJ1V0DS00
A
X
X
= 40 to +85 C, V
)
)
Note 1
Note 1
X
X
)
)
Note 1
Note 1
Note 2
Note 2
V
voltage range
After V
oscillation voltage
range MIN.
V
V
V
DD
DD
DD
DD
DD
= oscillation
= 4.5 to 5.5 V
= 2.7 to 5.5 V
= 2.7 to 5.5 V
Conditions
DD
= 1.8 to 5.5 V)
reaches
PD78F9177, 78F9177Y
MIN.
1.0
1.0
1.0
1.0
85
85
TYP.
MAX.
500
500
5.0
5.0
5.0
5.0
10
30
4
SS0
.
MHz
MHz
MHz
MHz
Unit
ms
ms
ns
ns