AT89S8252(2000) 查看數據表（PDF） - Atmel Corporation

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AT89S8252
(Rev.:2000)

8-bit Microcontroller with 8K Bytes Flash

Atmel Corporation 

Figure 10. Interrupt Sources

AT89S8252

Figure 11. Oscillator Connections

Note: Note: C1, C2 = 30 pF ± 10 pF for Crystals

= 40 pF ± 10 pF for Ceramic Resonators

Figure 12. External Clock Drive Configuration

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 maxi-

mum voltage high and low time specifications must be

observed.

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