參數(shù)資料
型號: HD404618FS
廠商: Hitachi,Ltd.
英文描述: 4-Bit Single-Chip Microcomputer
中文描述: 4位單片機
文件頁數(shù): 36/89頁
文件大?。?/td> 358K
代理商: HD404618FS
HD404618 Series
36
Table 18 Oscillator Circuit Examples
Circuit Configuration
Circuit Constants
External clock operation
(OSC
1
, OSC
2
)
External
oscillator
OSC
Open
1
OSC
2
Ceramic oscillator
(OSC
1
, OSC
2
)
OSC
2
C
1
2
C
OSC
1
R
f
Ceramic
GND
Ceramic oscillator: CSB400P22,
CSB400P (Murata)
R
f
= 1 M
±
20%
C
= C
= 220 pF
±
5%
Ceramic oscillator: CSB800J122,
CSB800J(Murata)
R
f
= 1 M
±
20%
C
1
= C
2
= 220 pF
±
5%
Crystal oscillator
X1
C
1
2
C
X2
Crystal
GND
L
S
C R
S
C
0
Crystal: 32.768 kHz: MX38T
(Nippon Denpa Kogyo)
R
s
= 14 k
C
0
= 1.5 pF
C
1
= 20 pF
±
20%
C
2
= 20 pF
±
20%
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 OSC
/OSC
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 V
CC
and leave the X2 pin open.
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