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AT89 データシート(PDF) 21 Page - ATMEL Corporation

部品番号 AT89
部品情報  8-Bit Microcontroller with 8K Bytes Flash
PDF  41 Pages
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メーカー  ATMEL [ATMEL Corporation]
ホームページ  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89 データシート(HTML) 21 Page - ATMEL Corporation

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21
AT89S8252
0401F–MICRO–11/03
Oscillator
Characteristics
XTAL1 and XTAL2 are the input and output, respectively, of an inverting amplifier that
can be configured for use as an on-chip oscillator, as shown in Figure 11. Either a
quartz crystal or ceramic resonator may be used. To drive the device from an external
clock source, XTAL2 should be left unconnected while XTAL1 is driven, as shown in
Figure 12. There are no requirements on the duty cycle of the external clock signal,
since the input to the internal clocking circuitry is through a divide-by-two flip-flop, but
minimum and maximum voltage high and low time specifications must be observed.
Figure 11. Oscillator Connections
Note:
C1, C2 =
30 pF ± 10 pF for Crystals
=
40 pF ± 10 pF for Ceramic Resonators
Figure 12. External Clock Drive Configuration



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