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HD404849FS bảng dữ liệu(PDF) 45 Page - Renesas Technology Corp

tên linh kiện HD404849FS
Giải thích chi tiết về linh kiện  4-Bit Single-Chip Microcomputer
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HD404849FS bảng dữ liệu(HTML) 45 Page - Renesas Technology Corp

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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
C1
2
C
OSC
1
Rf
Ceramic
oscillator
GND
Ceramic oscillator:
CSA4.00MG (Murata)
R
f = 1 MΩ ± 20%
C
1 = C2 = 30 pF ± 20%
Crystal oscillator
(OSC
1,OSC2)
L
S
C
RS
C0
OSC1
OSC2
OSC
2
C1
2
C
OSC
1
Rf
Crystal
oscillator
GND
R
f = 1 MΩ ± 20%
C
1 = C2 = 10 to 22 pF ± 20%
Equivalent circuit of crystal
oscillator shown at left.
C
0:
7 pF max
R
S:
100
Ω max
Crystal oscillator
(X1, X2)
X1
C1
2
C
X2
Crystal
oscillator
GND
L
S
C
RS
C0
X1
X2
Crystal: 32.768 kHz: MX38T
(Nippon Denpa)
C
1 = C2 = 20 pF ± 20%
R
S:
14 k
Ω
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
1 and OSC 2 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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