at90ls8535-8mi ATMEL Corporation, at90ls8535-8mi Datasheet - Page 6
at90ls8535-8mi
Manufacturer Part Number
at90ls8535-8mi
Description
8-bit Microcontroller With 8k Bytes In-system Programmable Flash
Manufacturer
ATMEL Corporation
Datasheet
1.AT90LS8535-8MI.pdf
(127 pages)
- Current page: 6 of 127
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Clock Options
Crystal Oscillator
External Clock
Timer Oscillator
6
AT90S/LS8535
XTAL1 and XTAL2 are input and output, respectively, of an inverting amplifier which can
be configured for use as an on-chip oscillator, as shown in Figure 2. Either a quartz
crystal or a ceramic resonator may be used.
Figure 2. Oscillator Connections
Note:
To drive the device from an external clock source, XTAL2 should be left unconnected
while XTAL1 is driven as shown in Figure 3.
Figure 3. External Clock Drive Configuration
For the Timer Oscillator pins, TOSC1 and TOSC2, the crystal is connected directly
between the pins. No external capacitors are needed. The oscillator is optimized for use
with a 32,768 Hz watch crystal. Applying an external clock source to TOSC1 is not
recommended.
When using the MCU Oscillator as a clock for an external device, an HC buffer should be
connected as indicated in the figure.
HC
MAX 1 HC BUFFER
C2
C1
XTAL2
XTAL1
GND
1041H–11/01
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