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HD404339FS 데이터시트(PDF) 30 Page - Renesas Technology Corp

부품명 HD404339FS
상세설명  microcomputer with large-capacity memory designed to
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제조업체  RENESAS [Renesas Technology Corp]
홈페이지  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD404339FS 데이터시트(HTML) 30 Page - Renesas Technology Corp

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HD404339 Series
28
Table 4
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
GND
Ceramic oscillator: CSA4.00MG
(Murata)
R
f = 1 MΩ ±20%
C
1 = C2 = 30 pF ±20%
Crystal oscillator
(OSC
1, OSC 2)
OSC
2
C1
2
C
OSC
1
Rf
Crystal
GND
L
S
C
RS
C0
OSC1
OSC2
R
f = 1 MΩ ±20%
C
1 = C2 = 10 to 22 pF ±20%
Crystal: Equivalent to circuit shown below
C
0 = 7 pF max.
R
S = 100 Ω max.
Crystal oscillator
(X1, X2)
X1
C1
2
C
X2
Crystal
GND
L
S
C
RS
C0
X1
X2
Crystal: 32.768 kHz: MX38T (Nippon
Denpa)
C
1 = C2 = 20 pF ±20%
R
S = 14 kΩ
C
0 = 1.5 pF
Notes: 1. Since the circuit constants change depending on the crystal or ceramic oscillator and stray
capacitance of the board, the user should consult with the crystal or ceramic oscillator
manufacturer to determine the circuit parameters.
2. Wiring among OSC
1, OSC 2, X1, X2 and elements should be as short as possible, and must not
cross other wiring (see figure 19).
3. When a 32.768-kHz crystal oscillator is not used, fix pin X1 to GND and leave pin X2 open.



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