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| HD404328 Datasheet, PDF (40/96 Pages) Hitachi Semiconductor – 4 BIT SINGLE CHIP MICROCOMPUTER | |||
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HD404328 Series
Table 21 Oscillator Circuit Examples
External Clock
Operation
(OSC1, OSC2)
Circuit Configuration
External
oscillator
OSC1
Open
OSC2
Ceramic
Oscillator
(OSC1, OSC2)
Crystal Oscillator
(OSC1, OSC2)
C1
Ceramic
C2
GND
OSC1
Rf
OSC2
C1
Crystal
C2
OSC1
Rf
OSC2
GND AT-cut parallel
resonance crystal
Circuit Constants
Ceramic: CSA4.00MG
(Murata)
Rf = 1 M⦠±20%
C1= C2 = 30 pF ±20%
Rf: 1 M⦠±20%
C1 = C2 = 10 pF ±10%
Crystal: Equivalent to circuit shown
at bottom left
C0 = 7 pF, max.
RS= 100 ⦠, max.
f = 1.0 MHz to 4.5 MHz
Crystal Oscillator
(X1, X2)
OSC1
L CS RS
C0
C1
X1
Crystal
X2
C2
GND
OSC2
C1 =C2 = 15 pF ±5%
Crystal: 32.768 kHz, MX38T
(Nippon Denpa)
C0 = 1.5 pF, typ.
RS= 14 k⦠, typ.
X1
L CS RS
X2
Notes:
C0
1. Circuit constants differ with different types of crystal and ceramic oscillators, and with the stray
capacitance of the board, so consult the manufacturer of the oscillator to determine the circuit
parameters.
2. The wiring between the OSC1 and OSC2 pins (X1 and X2 pins) and the other elements should
be as short as possible, and must not cross other wiring. Refer to figure 23.
3. If not using a 32.768-kHz crystal oscillator, fix the X1 pin to VCC and leave the X2 pin open.
38
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