UPD78F0034A NEC, UPD78F0034A Datasheet - Page 25

• Manufacturer Part Number: UPD78F0034A
• Description: 8 Bit Single Chip Microcontroller
• Manufacturer: NEC

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Capacitance (T
Main System Clock Oscillator Characteristics (T
Input
capacitance
I/O
capacitance
Ceramic
resonator
Crystal
resonator
External
clock
Resonator
Parameter
Remark Unless otherwise specified, the characteristics of alternate-function pins are the same as those of port
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
2. Time required to stabilize oscillation after reset or STOP mode release.
pins.
2. When the main system clock is stopped and the system is operating on the subsystem clock,
Recommended Circuit
µ
A
C
C
PD74HCU04
Symbol
• 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 to 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.
broken lines in the above figures to avoid an adverse effect from wiring capacitance.
wait until the oscillation stabilization time has been secured by the program before switching
back to the main system clock.
V
= 25
IN
IO
V
PP
PP
C2
C2
X2
X2
X2
°
C, V
R1
C1
C1
DD
f = 1 MHz
Unmeasured pins returned to 0 V.
f = 1 MHz
Unmeasured pins
returned to 0 V.
X1
X1
X1
= V
SS
Oscillation
frequency (f
Oscillation
stabilization time
Oscillation
frequency (f
Oscillation
stabilization time
X1 input
frequency (f
X1 input high-/low-level
width (t
= 0 V)
Parameter
XH
, t
Data Sheet U14040EJ4V0DS
XL
X
X
X
Conditions
)
)
)
)
Note 1
Note 1
Note 1
A
Note 2
Note 2
P00 to P03, P20 to P25,
P50 to P57, P64 to P67,
P70 to P75,
P30 to P33
P34 to P36, P40 to P47,
= –40 to +85
V
V
After V
lation voltage range MIN.
V
V
V
V
V
V
V
V
DD
DD
DD
DD
DD
DD
DD
DD
DD
DD
= 4.0 to 5.5 V
= 1.8 to 5.5 V
= 4.0 to 5.5 V
= 1.8 to 5.5 V
= 4.0 to 5.5 V
= 1.8 to 5.5 V
= 4.0 to 5.5 V
= 1.8 to 5.5 V
= 4.0 to 5.5 V
= 1.8 to 5.5 V
°
C, V
DD
Conditions
reaches oscil-
DD
µ PD78F0034A, 78F0034AY
= 1.8 to 5.5 V)
MIN.
MIN.
1.0
1.0
1.0
1.0
1.0
1.0
50
85
TYP.
TYP.
MAX.
15
15
20
MAX.
8.38
8.38
8.38
500
500
5.0
5.0
5.0
10
30
4
Unit
MHz
MHz
MHz
pF
pF
pF
Unit
ms
ms
ns
SS1
25
.