參數(shù)資料
型號(hào): UPD78F0547GC(T)-UBT-A
元件分類: 微控制器/微處理器
英文描述: 8-BIT, FLASH, 20 MHz, MICROCONTROLLER, PQFP80
封裝: 14 X 14 MM, LEAD FREE, PLASTIC, LQFP-80
文件頁(yè)數(shù): 80/96頁(yè)
文件大?。?/td> 4109K
代理商: UPD78F0547GC(T)-UBT-A
Preliminary Product Information U14673EJ1V0PM00
81
PD789322,789324,789326,789327
Subsystem Clock Oscillator Characteristics (TA =
40 to +85°C, VDD = 1.8 to 5.5 V)
Resonator
Recommended Circuit
Parameter
Conditions
MIN.
TYP.
MAX.
Unit
Oscillation frequency
(fXT)
Note 1
32
32.768
35
kHz
VDD = 4.5 to 5.5 V
1.2
2
Crystal
resonator
XT2
XT1
IC
C4
C3
R
Oscillation
stabilization time
Note 2
10
s
XT1 input frequency
(fXT)
Note 1
32
35
kHz
External
clock
XT1
XT2
XT1 input high-/low-
level width (tXTH, tXTL)
14.3
15.6
s
Notes 1. Indicates only oscillator characteristics. Refer to AC Characteristics for instruction execution time.
2. The time required for oscillation to stabilize after VDD reaches the MIN. oscillation voltage range. Use a
resonator to stabilize oscillation during the oscillation wait time.
Cautions 1. When using the subsystem clock oscillator, wire as follows in the area enclosed by the
broken lines in the above figures to avoid an adverse effect from wiring capacitance.
Keep the wiring length as short as possible.
Do not cross the wiring with the other signal lines.
Do not route the wiring near a signal line through which a high fluctuating current flows.
Always make the ground point of the oscillator capacitor the same potential as VSS.
Do not ground the capacitor to a ground pattern through which a high current flows.
Do not fetch signals from the oscillator.
2. The subsystem clock oscillator is designed as a low-amplitude circuit for reducing current
consumption, 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.
Remark For the resonator selection and oscillator constant, customers are requested to either evaluate the
oscillation themselves or apply to the resonator manufacturer for evaluation.
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