UPD753012GC NEC, UPD753012GC Datasheet - Page 57

• Manufacturer Part Number: UPD753012GC
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER
• Manufacturer: NEC

Subsystem Clock Oscillator Characteristics (T
Notes 1.
Caution When using the subsystem clock oscillator, wire the portion enclosed by the dotted line in the
Crystal
oscillator
External
clock
Oscillator
2.
above figure as follows to prevent adverse influence from to wiring capacitance:
The subsystem clock oscillator has a low amplification factor to reduce current dissipation and
is more susceptible to noise than the main system clock oscillator. Therefore, exercise utmost
care in wiring the subsystem clock oscillator.
· Keep the wiring length as short as possible.
· Do not cross the wiring with any other signal lines.
· Do not route the wiring in the vicinity of a line through which a high alternating current flows.
· Always keep the ground point of the capacitor of the oscillator at the same potential as V
· Do not ground to a power supply pattern through which a high current flows.
· Do not extract any signal from the oscillator.
The oscillation frequency shown above indicate characteristics of the oscillator only. For the instruction
execution time, refer to AC Characteristics.
The oscillation stabilization time is the time required for oscillation to be stabilized after V
applied.
C3
Recommended
XT1
XT1
Constants
V
XT2
XT2
DD
R
C4
Oscillation frequency
(f
Oscillation
stabilization time
XT1 input frequency
(f
XT1 input high-,
low-level widths
(t
XT
XT
XTH
)
)
Note 1
Note 1
, t
Parameter
XTL
)
A
= –40 to +85 ˚C)
Note 2
V
V
V
V
V
DD
DD
DD
DD
DD
= 2.2 to 5.5 V
= 4.5 to 5.5 V
= 2.2 to 5.5 V
= 1.8 to 5.5 V
= 1.8 to 5.5 V
Conditions
PD753012, 753016, 753017
MIN.
32
32
5
32.768
TYP.
1.0
MAX.
100
35
10
15
DD
2
has been
Unit
kHz
kHz
s
s
DD
57
.