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| HD404618 Datasheet, PDF (38/91 Pages) Hitachi Semiconductor – 4-Bit Single-Chip Microcomputer | |||
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HD404618 Series
Table 18 Oscillator Circuit Examples
Circuit Configuration
External clock operation
(OSC1, OSC2)
External
oscillator
OSC 1
Open
OSC2
Circuit Constants
Ceramic oscillator
(OSC1, OSC2)
C1
Ceramic
C2
GND
OSC1
Rf
OSC2
Ceramic oscillator: CSB400P22,
CSB400P (Murata)
Rf = 1 M⦠± 20%
C1 = C2 = 220 pF ± 5%
Ceramic oscillator: CSB800J122,
CSB800J(Murata)
Rf = 1 M⦠± 20%
C1 = C2 = 220 pF ± 5%
Crystal oscillator
C1
X1
Crystal
X2
C2
GND
Crystal: 32.768 kHz: MX38T
(Nippon Denpa Kogyo)
Rs = 14 kâ¦
C0 = 1.5 pF
C1 = 20 pF ± 20%
C2 = 20 pF ± 20%
L CS RS
C0
Notes: 1. The circuit constants given above are recommended values provided by the oscillator
manufacturer. Since they may be affected by stray capacitances from the oscillator or board,
consult the crystal or ceramic oscillator manufacturer to determine the actual circuit parameters
required.
2. Wiring between the OSC1/OSC2 pins (X1, X2 pins) and other elements must be as short as
possible, and must not cross other wiring. Refer to the recommended layout of the crystal and
ceramic oscillator in figure 22.
3. If a 32.768-kHz crystal oscillator is not used, fix the X1 pin to VCC and leave the X2 pin open.
36
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