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| HD404369 Datasheet, PDF (43/117 Pages) Hitachi Semiconductor – 4-bit HMCS400-Series microcomputer | |||
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Table 20 Oscillator Circuit Examples
External clock
operation
Circut Configuration
External
oscillator
OSC 1
HD404369 Series
Circut Constants
Open
OSC2
Ceramic oscillator
(OSC1, OSC2)
C1
Ceramic
C2
GND
Crystal oscillator
(OSC1, OSC2)
C1
Crystal
C2
GND
OSC1
Rf
OSC2
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
Crystal oscillator
(X1, X2)
C0
C1
X1
Crystal
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 25).
3. When a 32.768-kHz crystal oscillator is not used, fix pin X1 to GND and leave pin X2 open.
41
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