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參數(shù)資料
| 型號： | μPD78064B |
| 廠商： | NEC Corp. |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8 Bit Single Chip Microcontrollers |
| 中文描述： | 8位單片機微控制器 |
| 文件頁數(shù)： | 36/64頁 |
| 文件大?。?/td> | 391K |
| 代理商： | ΜPD78064B |
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36
μ
PD78064B
SUBSYSTEM CLOCK OSCILLATOR CHARACTERISTICS (T
A
= –40 to +85
°
C, V
DD
= 2.0 to 6.0 V)
Resonator
Recommended circuit
Parameter
Test conditions
MIN.
TYP.
MAX.
Unit
Crystal
resonator
Oscillation frequency
(f
XT
)
Note 1
32
32.768
35
kHz
Oscillation stabilization
time
Note 2
V
DD
= 4.5 to 6.0 V
1.2
2
s
10
External clock
XT1 input frequency
(f
XT
)
Note 1
32
100
kHz
XT1 input
high-/low-level
width (t
XTH
/t
XTL
)
5
15
μ
s
Notes
1.
Indicates only oscillator characteristics. Refer to
AC CHARACTERISTICS
for instruction execution time.
2.
Time required to stabilize oscillation after V
DD
has reached the minimum oscillation voltage range.
Cautions 1. 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.
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
SS
.
Do not ground it to the ground pattern in which a high current flows.
Do not fetch a signal from the oscillator.
2. The subsystem clock oscillator is designed as a low amplification circuit to provide low
consumption current, causing misoperation by noise more frequently than the main system
clock oscillation circuit. Special care should therefore be taken to wiring method when the
subsystem clock is used.
R2
XT2
XT1
IC
C4
C3
XT1
XT2
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