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| HD404654 Datasheet, PDF (36/111 Pages) Hitachi Semiconductor – 4-Bit Single-Chip Microcomputer | |||
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HD404654 Series
Table 18 Oscillator Circuit Examples
Circuit Configuration
External clock operation
External
oscillator
OSC 1
Open
OSC2
Circuit Constants
Ceramic oscillator
(OSC1, OSC2)
C1
Ceramic
oscillator
C2
GND
OSC1
Rf
OSC2
Ceramic oscillator: CSB400P22
(Murata), CSB400P (Murata)
Rf = 1 M⦠± 20%
C1 = C2 = 220 pF ± 5%
Ceramic oscillator: CSB800J122
(Murata), CSB800J (Murata)
Rf = 1 M⦠± 20%
C1 = C2 = 220 pF ± 5%
Ceramic oscillator: CSA2.00MG
(Murata)
Rf = 1 M⦠± 20%
C1 = C2 = 30 pF ± 20%
Ceramic oscillator: CSA4.00MG
(Murata)
Rf = 1 M⦠± 20%
C1 = C2 = 30 pF ± 20%
Ceramic oscillator: CSA3.58MG
(Murata)
Rf = 1 M⦠± 20%
C1 = C2 = 30 pF ± 20%
Notes: 1. Since the circuit constants change depending on the ceramic oscillator and stray capacitance of
the board, the user should consult with the 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 20).
34
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