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HD404849FS データシート(PDF) 45 Page - Renesas Technology Corp

部品番号 HD404849FS
部品情報  4-Bit Single-Chip Microcomputer
PDF  127 Pages
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メーカー  RENESAS [Renesas Technology Corp]
ホームページ  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD404849FS データシート(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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