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| HD404054 Datasheet, PDF (31/101 Pages) Hitachi Semiconductor – HMCS400-series microcomputers designed to increase program productivity with large-capacity memory | |||
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Table 18 Oscillator Circuit Examples
External clock
operation
Circuit Configuration
External
oscillator
OSC 1
HD404054 Series/HD404094 Series
Circuit Constants
Open
OSC2
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 18).
31
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