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| HD404358 Datasheet, PDF (33/102 Pages) Renesas Technology Corp – microcomputer has an A/D converter, | |||
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Table 20 Oscillator Circuit Examples
External clock
operation
Circuit Configuration
External
oscillator
OSC 1
HD404358 Series
Circuit Constants
Open
OSC2
Ceramic oscillator
(OSC1, OSC2)
Crystal oscillator
(OSC1, OSC2)
C1
Ceramic
C2
GND
OSC1
Rf
OSC2
C1
Crystal
C2
GND
OSC1
Rf
OSC2
L CS RS
Ceramic oscillator:
CSA4.00MG
(Murata)
Rf = 1 M⦠±20%
C1 = C2 = 30 pF ±20%
Rf = 1 M⦠±20%
C1 = C2 = 10 to 22 pF ±20%
Crystal: Equivalent to circuit
shown below
C0 = 7 pF max.
RS = 100 ⦠max.
OSC1
OSC2
CO
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 OSC1, OSC2, and elements should be as short as possible, and must not cross
other wiring (see figure 18).
31
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