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HD404374FT Datasheet(PDF) 57 Page - Renesas Technology Corp

Part # HD404374FT
Description  Low-Voltage AS Microcomputers with On-Chip A/D Converter
PDF  161 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD404374FT Datasheet(HTML) 57 Page - Renesas Technology Corp

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HD404374/HD404384/HD404389/HD404082/HD404084 Series
Rev.5.00, Sep.11.2003, page 57 of 161
Table 21
Oscillator Circuit Examples
Circuit Structure
Circuit Constants
External clock
operation
External
oscillator
OSC1
OSC2
Open
Ceramic oscillator
(OSC
1, OSC2)
OSC1
OSC2
C1
C2
Rf
GND
Ceramic
oscillator
Ceramic oscillator: CSA4.00MG (Murata)
R
f=1MΩ±20%
C
1=C2=24pF±20%
Crystal oscillator
(OSC
1, OSC2)
OSC1
OSC2
C1
C2
Rf
GND
Crystal
oscillator
R
f=1MΩ±20%
C
1=C2=10–20pF±20%
CR oscillator*
4
(OSC
1, OSC2)
OSC1
OSC2
Rf
R
f=20kΩ±1%
Crystal oscillator
(X1, X2)
HD404374 Series
X1
X2
C1
C2
GND
Crystal
oscillator
Crystal: 32.768 kHz: MX38T (Nihon Denpa
Kogyo)
C
1=C2=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
1 and OSC2 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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