參數(shù)資料
型號: HD4074459
廠商: Hitachi,Ltd.
英文描述: 4-bit HMCS400-Series microcomputer(4位單片微計算機)
中文描述: 4位HMCS400系列微機(4位單片微計算機)
文件頁數(shù): 43/120頁
文件大?。?/td> 692K
代理商: HD4074459
HD404459 Series
43
Table 22
Oscillator Circuit Examples
Circuit Configuration
Circuit 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
Crystal oscillator
(OSC
1
, OSC
2
)
C
1
2
C
Crystal
GND
L
S
C
R
S
C
0
f
R
OSC
1
OSC
2
OSC
2
OSC
1
R
f
= 1 M
±
20%
C
1
= C
2
= 10–22 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 Kogyo)
C
1
= C
2
= 15 pF
±
5%
R
S
: 14 k
C
0
: 1.5 pF
Notes: 1. Since the circuit constants change depending on the crystal or ceramic resonator 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 (figure 28).
3. If the 32.768-kHz crystal oscillator is not used, the X1
pin must be fixed to GND and X2 must be
open.
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