參數(shù)資料
型號(hào)： μPD789012
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)： 26/44頁(yè)
文件大?。?/td> 271K
代理商： ΜPD789012
μ
PD789011, 789012
26
Main System Clock Oscillation Circuit Characteristics (T
A
= –40 to +85
°
C, V
DD
= 1.8 to 5.5 V)
Resonator
Recommended Circuit
Parameter
Test Condition
MIN.
TYP. MAX. Unit
Ceramic
resonator
Oscillator frequency (fx)
Note 1
V
DD
= Oscillating voltage
range
1.0
5.0
MHz
Oscillation stabilization
time
Note 2
After V
DD
reaches oscillator
voltage range MIN.
4
ms
Crystal
resonator
Oscillating frequency (fx)
Note 1
1.0
5.0
MHz
Oscillation stabilization
time
Note 2
V
DD
= 4.5 to 5.5 V
10
ms
30
External
clock
X1 input frequency (fx)
Note 1
1.0
5.0
MHz
X1 input high/low level width
(t
XH
, t
XL
)
100
500
ns
Notes 1.
Indicates only oscillation circuit characteristics. Refer to AC characteristics for instruction execution
time.
2.
Time required to stabilize oscillation after reset or STOP mode release.
Caution
When using the main system clock oscillator, wiring 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 higher 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.
X1
X2
X1
X2
C1
C2
X1
X2
C1
C2
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