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| HD404019R Datasheet, PDF (36/65 Pages) Renesas Technology Corp – CMOS 4-bit single-chip microcomputers | |||
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HD404019R Series
Table 20 Examples of Oscillator Circuits
External clock
operation
(OSC1, OSC2)
Circuit Configuration
Oscillator OSC1
Circuit Constants
Open
OSC2
Ceramic oscillator
(OSC1, OSC2)
Crystal oscillator
(OSC1, OSC2)
C1
Ceramic
oscillator
Rf
C2
GND
OSC1
OSC2
C1
Crystal
Rf
C2
GND
OSC1
OSC2
AT-cut parallel
resonance crystal
OSC1
L
C1 RS
Ceramic oscillator
CSA4.00MG (Murata)
Rf: 1 M⦠±20%
C1: 30 pF ±20%
C2: 30 pF ±20%
Rf: 1 M⦠±20%
C1: 10 pF to 22 pF ±20%
C2: 10 pF to 22 pF ±20%
Crystal: Equivalent circuit shown
at bottom left
Co: 7 pF max.
Rs: 100 ⦠max.
f: 1.0 MHz to 4.5 MHz
OSC2
C0
Notes: 1. The circuit parameters written above are recommended by the crystal or ceramic oscillator
manufacturer. The circuit parameters are affected by the crystal, ceramic resonator, and the
floating capacitance when designing the board.
When using the resonator, consult with the crystal or ceramic oscillator manufacturer to
determine the circuit parameters.
2. Wiring among OSC1, OSC2, and other elements should be as short as possible, and avoid
crossing other wires. Refer to the recommended layout of the crystal and ceramic oscillator.
Refer to figure 17.
34
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