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| HD404339 Datasheet, PDF (30/80 Pages) Hitachi Semiconductor – 4-bit HMCS400-Series microcomputer with large-capacity memory | |||
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HD404339 Series
Table 4 Oscillator Circuit Examples
External clock
operation
Circuit Configuration
External
oscillator
OSC 1
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.
Crystal oscillator
(X1, X2)
OSC1
C1
Crystal
C0
X1
C2
GND
X2
L CS RS
OSC2
Crystal: 32.768 kHz: MX38T (Nippon
Denpa)
C1 = C2 = 20 pF ±20%
RS = 14 kâ¦
C0 = 1.5 pF
X1
X2
C0
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, X1, X2 and elements should be as short as possible, and must not
cross other wiring (see figure 19).
3. When a 32.768-kHz crystal oscillator is not used, fix pin X1 to GND and leave pin X2 open.
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