UPD75P3116 NEC, UPD75P3116 Datasheet - Page 33

• Manufacturer Part Number: UPD75P3116
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER
• Manufacturer: NEC

SUBSYSTEM CLOCK OSCILLATOR CHARACTERISTICS (T
Notes 1.
Caution
Crystal
resonator
External
clock
Resonator
2.
When using the subsystem clock oscillator, wiring in the area enclosed with the dotted line should
be carried out as follows to avoid an adverse effect from wiring capacitance.
The subsystem clock oscillator is designed as a low amplification circuit to provide low consumption
current, and is more liable to misoperation by noise than the main system clock oscillation circuit.
Special care should therefore be taken regarding the wiring method when the subsystem clock is
used.
• Wiring should be as short as possible.
• Wiring should not cross other signal lines.
• Wiring should not be placed close to a varying high current.
• The potential of the oscillator capacitor ground should be the same as V
• Do not ground to a ground pattern in which a high current flows.
• Do not fetch a signal from the oscillator.
Indicates only oscillator characteristics. Refer to AC Characteristics for instruction execution time.
The oscillation stabilization time is necessary for oscillation to stabilize after applying V
Recommended constant
C3
XT1
XT1
V
DD
XT2
XT2
R
C4
Oscillation
frequency (f
Oscillation
stabilization time
XT1 input frequency
(f
XT1 input high-/low-level
width (t
XT
)
Note 1
Parameter
XTH
, t
XT
XTL
)
)
Note 1
Note 2
A
V
= –40 to +85˚C, V
DD
Test conditions
= 4.5 to 5.5 V
DD
= 1.8 to 5.5 V)
MIN.
32
32
5
DD
32.768
.
TYP.
1.0
PD75P3116
MAX.
100
35
10
15
DD
2
.
Unit
kHz
kHz
s
s
33