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| 型號(hào)： | μPD78074B |
| 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(yè)數(shù)： | 41/76頁(yè) |
| 文件大小： | 568K |
| 代理商： | ΜPD78074B |
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41
μ
PD78074B, 78075B
Resonator
Recommended
Parameter
Conditions
MIN.
TYP.
MAX.
Unit
Circuit
Crystal
resonator
Oscillation
frequency (f
XT
)
Note 1
32
32.768
35
kHz
Oscillation
stabilization time
Note 2
V
DD
= 4.5 to 5.5 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
SUBSYSTEM CLOCK OSCILLATION CIRCUIT CHARACTERISTICS (T
A
= –40 to +85
°
C, V
DD
= 1.8 to 5.5 V)
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 range MIN.
Cautions
1.
When using the subsystem clock oscillation circuit, wiring in the area enclosed with the broken
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 oscillation circuit capacitor ground should always be the same as that
of V
SS
.
Do not ground wiring to a ground pattern in which a high current flows.
Do not fetch a signal from the oscillation circuit.
2.
The subsystem clock oscillation circuit is designed to be a circuit with a low amplification level,
for low current consumption more prone to misoperation due to noise than that of the main
system clock. Therefore, when using the subsystem clock, take special cautions for wiring
methods.
IC XT1
XT2
C3
C4
R2
XT2
XT1
PD74HCU04
μ
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