參數(shù)資料
型號: HD404848TF
廠商: Hitachi,Ltd.
英文描述: PLASTIC-GRIP
中文描述: 4位單片機(jī)
文件頁數(shù): 43/125頁
文件大?。?/td> 471K
代理商: HD404848TF
HD404849 Series
43
Table 22 Oscillator Circuit Examples
Circuit Configuration
Circuit Constants
External clock
operation
External
oscillator
OSC
Open
1
OSC
2
Ceramic
oscillator
(OSC
1
, OSC
2
)
OSC
2
C
1
2
C
OSC
1
R
f
Ceramic
oscillator
GND
Ceramic oscillator:
CSA4.00MG (Murata)
R
f
= 1 M
±
20%
C
1
= C
2
= 30 pF
±
20%
Crystal oscillator
(OSC
1
,OSC
2
)
L
S
C
R
S
C
0
OSC
1
OSC
2
OSC
2
C
1
2
C
OSC
1
R
f
Crystal
oscillator
GND
R
f
= 1 M
±
20%
C
1
= C
2
= 10 to 22 pF
±
20%
Equivalent circuit of crystal
oscillator shown at left.
C
0
: 7 pF max
R
S
: 100
max
Crystal oscillator
(X1, X2)
X1
C
1
2
C
X2
Crystal
oscillator
GND
L
S
C
R
S
C
0
X1
X2
Crystal: 32.768 kHz: MX38T
(Nippon Denpa)
C
1
= C
2
= 20 pF
±
20%
R
S
: 14 k
C
0
: 1.5 pF
Notes: 1. Circuit constants differ by the different types of crystal oscillators and ceramic oscillators, and
with the stray capacitance of the board, so consult the manufacturer of the oscillator to determine
the circuit parameters.
2. The wiring between the OSC
and OSC
pins (X1 and X2 pins) and the other elements should be
as short as possible, and must not cross other wiring. Refer to figure 27.
3. If not using a 32.768-kHz crystal oscillator, fix the X1 pin to V
CC
and leave the X2 pin open.
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