參數(shù)資料
型號: μPD78054(A)
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位單片機微控制器(8位單片微控制器)
文件頁數(shù): 39/76頁
文件大?。?/td> 386K
代理商: ΜPD78054(A)
39
μ
PD78052(A), 78053(A), 78054(A)
SUBSYSTEM CLOCK OSCILLATION CIRCUIT CHARACTERISTICS
(T
A
= –40 to +85
°
C, V
DD
= 2.0 to 6.0 V)
MIN.
32
32
5
Notes 1.
Indicates only oscillation circuit characteristics. Refer to “AC Characteristics” for instruction execution time.
2.
Time required to stabilize oscillation after V
DD
reaches oscillation voltage MIN.
Resonator
Crystal
resonator
External
clock
Parameter
Oscillation
frequency (f
XT
)
Note 1
Oscillation
stabilization time
Note 2
XT1 input
frequency (f
XT
)
Note 1
XT1 input
high-/low-level width
(t
XTH
, t
XTL
)
Test Conditions
TYP.
32.768
1.2
MAX.
35
2
10
100
15
Unit
kHz
s
kHz
μ
s
Cautions
1. When using the subsystem clock oscillator, wiring in the area enclosed with the broken line in
the above figure 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 wiring to a ground pattern in which a high current flows.
Do not fetch a signal from the oscillator.
2. The subsystem clock oscillator is a low-amplitude circuit in order to achieve a low consumption
current, and is more prone to malfunction due to noise than the main system clock oscillator.
Particular care is therefore required with the wiring method when the subsystem clock is used.
V
DD
= 4.5 to 6.0 V
Recommended Circuit
XT2
XT1
IC
R1
C4
C3
XT1
XT2
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