AT94K05AL ATMEL Corporation, AT94K05AL Datasheet - Page 41

• Manufacturer Part Number: AT94K05AL
• Description: Fpslic Devices Combine 5K Gates of Atmel's Patented AT40K Fpga Architecture, a 20 Mips Avr 8-bit Risc Microprocessor Core, Numerous Fixed Microcontroller Peripheries And up to 36K Bytes of Program And Data SRAM.
• Manufacturer: ATMEL Corporation

XTAL2
TOSC1
TOSC2
SCL
SDA
Clock Options
Crystal Oscillator
External Clock
Rev. 1138F–FPSLI–06/02
Output from the inverting oscillator amplifier
Input to the inverting timer/counter oscillator amplifier
Output from the inverting timer/counter oscillator amplifier
2-wire serial input/output clock
2-wire serial input/output data
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 24. Either a quartz crystal or a
ceramic resonator may be used.
Figure 24. Oscillator Connections
To drive the device from an external clock source, XTAL2 should be left unconnected while
XTAL1 is driven as shown in Figure 25.
Figure 25. External Clock Drive Configuration
OSCILLATOR
EXTERNAL
HC
SIGNAL
MAX 1 HC BUFFER
NC
C2
C1
AT94K Series FPSLIC
GND
XTAL2
XTAL1
XTAL2
XTAL1
GND
R
BIAS
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