參數(shù)資料
型號： μPD78F9177Y
廠商： NEC Corp.
英文描述： 8 Bit Single Chip Microcontrollers(8 位單片微控制器)
中文描述： 8位單片機(jī)微控制器（8位單片微控制器）
文件頁數(shù)： 126/150頁
文件大?。?/td> 653K
代理商： ΜPD78F9177Y
Preliminary Product Information
124
μ
PD78F9177Y
CHARACTERISTICS OF THE MAIN SYSTEM CLOCK OSCILLATION CIRCUIT
(T
A
=
40
°
C to +85
°
C, V
DD
= 1.8 to 5.5 V)
Resonator
Recommended circuit
Parameter
Conditions
MIN.
TYP.
MAX.
Unit
Ceramic
resonator
Oscillator frequency (f
X
)
Note 1
V
DD
= oscillation voltage
range
1.0
5.0
MHz
Oscillation settling time
Notes 2, 3
Clearing by RESET
2
15
/f
X
4
ms
Clearing by interrupt
Note 4
Crystal
Oscillator frequency (f
X
)
Note 1
1.0
5.0
MHz
Oscillation settling time
Note 2
V
DD
= 4.5 to 5.5 V
10
ms
30
External
clock
X1 input frequency (f
X
)
Note 1
1.0
5.0
MHz
X1 input high/low level width
(t
XH
, t
XL
)
85
500
ns
Notes 1.
Only the characteristic of the oscillation circuit is indicated. See the description of the AC characteristic
for the instruction execution time.
2.
Time required for oscillation to settle once a reset sequence ends or STOP mode is deselected.
3.
Time after V
DD
has reached the minimum value in the oscillation voltage range.
4.
A selection can be made from 2
oscillation settling time selection register (OSTS).
12
/f
X
, 2
15
/f
X
, and 2
17
/f
X
with bit 0 through 2 (OSTS0-OSTS2) of the
Cautions 1. When using the main system clock oscillation circuit, observe the following conditions for
the wiring of that section enclosed in dotted lines in the above diagrams, so as to avoid the
influence of the wiring capacitance.
Keep the wiring as short as possible.
Do not allow signal wires to cross one another.
Keep the wiring away from wires that carry a high, non-stable current.
Keep the grounding point of the capacitors at the same level as V
SS
.
Do not connect the grounding point to a grounding wire that carries a high current.
Do not extract a signal from the oscillation circuit.
2. Before switching from the subsystem clock back to the main system clock, always allow
sufficient time for the oscillation to settle by specifying it in the program.
X1
X2
C2
C1
X1
X2
C2
C1
X1
X2
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