參數(shù)資料
型號(hào): HD404369F
廠商: Hitachi,Ltd.
英文描述: 4-bit HMCS400-Series microcomputer
中文描述: 4位HMCS400系列微機(jī)
文件頁(yè)數(shù): 41/115頁(yè)
文件大小: 452K
代理商: HD404369F
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HD404369 Series
41
Table 20
Oscillator Circuit Examples
Circut Configuration
Circut Constants
External clock
operation
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: CSA4.00MG (Murata)
R
f
= 1 M
±
20%
C
1
= C
2
= 30 pF
±
20%
Crystal oscillator
(OSC
1
, OSC
2
)
OSC
2
C
1
2
C
OSC
1
R
f
Crystal
GND
L
S
C
R
S
C
0
OSC
1
OSC
2
R
f
= 1 M
±
20%
C
1
= C
2
= 10 to 22 pF
±
20%
Crystal: Equivalent to circuit shown below
C
0
= 7 pF max.
R
S
= 100
max.
Crystal oscillator
(X1, X2)
X1
C
1
2
C
X2
Crystal
GND
L
S
C
R
S
C
0
X1
X2
Crystal: 32.768 kHz: MX38T
(Nippon Denpa)
C
1
= C
2
= 20 pF
±
20%
R
S
= 14 k
C
0
= 1.5 pF
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 OSC
, OSC
, 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.
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