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參數(shù)資料
| 型號(hào)： | HD404324 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | 4-bit HMCS400-series microcomputer(4位單片微計(jì)算機(jī)) |
| 中文描述： | 4位HMCS400系列微電腦（4位單片微計(jì)算機(jī)） |
| 文件頁(yè)數(shù)： | 38/94頁(yè) |
| 文件大?。?/td> | 573K |
| 代理商： | HD404324 |
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HD404328 Series
38
Table 21
Oscillator Circuit Examples
Circuit Configuration
Circuit Constants
External Clock
Operation
(OSC , OSC )
2
External
oscillator
Open
OSC
1
OSC
2
OSC
1
OSC
2
1
C
R
Ceramic
2
C
GND
Ceramic
Oscillator
(OSC , OSC )
2
OSC
1
OSC
2
1
C
R
Crystal
2
C
GND
AT-cut parallel
resonance crystal
C
0
C
S
L
R
S
OSC
1
OSC
2
X1
X2
1
C
Crystal
2
C
GND
C
0
C
S
L
R
S
X2
X1
Crystal Oscillator
(OSC , OSC )
2
Crystal Oscillator
(X1, X2)
Ceramic: CSA4.00MG
(Murata)
R = 1 M
±
20%
C = C = 30 pF
±
20%
R : 1 M
C = C = 10 pF
±
10%
Crystal: Equivalent to circuit shown
at bottom left
C = 7 pF, max.
R = 100
, max.
f = 1.0 MHz to 4.5 MHz
C =C = 15 pF
±
5%
Crystal: 32.768 kHz, MX38T
(Nippon Denpa)
C = 1.5 pF, typ.
R = 14 k
, typ.
Notes:
1.
2.
3.
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.
The wiring between the OSC and OSC 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.
If not using a 32.768-kHz crystal oscillator, fix the X1 pin to V and leave the X2 pin open.
f
f
±
20%
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