參數(shù)資料
型號: HCD40C4084
廠商: Hitachi,Ltd.
英文描述: Low-Voltage AS Microcomputers with On-Chip A/D Converter(帶片上A/D轉換器的低壓微計算機)
中文描述: 低電壓如同在微機芯片的A / D轉換器(帶片上的A / D轉換器的低壓微計算機)
文件頁數(shù): 58/162頁
文件大小: 482K
代理商: HCD40C4084
HD404374/HD404384/HD404389/HD404082/HD404084 Series
58
Table 21
Oscillator Circuit Examples
Circuit Structure
Circuit Constants
External clock
operation
External
oscillator
OSC
1
OSC
2
Open
Ceramic oscillator
(OSC
1
, OSC
2
)
OSC
1
OSC
2
C
1
C
2
R
f
GND
Ceramic
oscillator
Ceramic oscillator: CSA4.00MG (Murata)
R
f
=1M
±
20%
C
1
=C
2
=24pF
±
20%
Crystal oscillator
(OSC
1
, OSC
2
)
OSC
1
OSC
2
C
1
C
2
R
f
GND
Crystal
oscillator
R
f
=1M
±
20%
C
1
=C
2
=10–20pF
±
20%
CR oscillator*
4
(OSC
1
, OSC
2
)
OSC
1
OSC
2
R
f
R
f
=20k
±
1%
Crystal oscillator
(X1, X2)
HD404374 Series
X1
X2
C
1
C
2
GND
Crystal
oscillator
Crystal: 32.768 kHz: MX38T (Nihon Denpa
Kogyo)
C
1
=C
2
=20pF
±
20%
Notes: 1. With a crystal or ceramic oscillator, circuit constants will differ depending on the resonator, stray
capacitance in the interconnecting circuit, and other factors. Suitable constants should be
determined in consultation with the resonator manufacturer.
2. Make the connections between the OSC
and OSC
pins (X1 and X2 pins) and external
components as short as possible, and ensure that no other lines cross these lines (see layout
example in figure 23).
3. When 32.768 kHz crystal oscillation is not used, fix the X1 pin at V
CC
and leave the X2 pin open.
4. Applies to HD40C4372, HD40C4374, HD40C4382, HD40C4384, HD40C4388, HD40C4389,
HD40C4081, HD40C4082, HCD40C4082, HD40C4084, HCD40C4084, HD407C4374 and
HD407C4384.
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