at94k40al ATMEL Corporation, at94k40al Datasheet - Page 41

• Manufacturer Part Number: at94k40al
• Description: At94kal Series Field Programmable System Level Integrated Circuit
• Manufacturer: ATMEL Corporation

4.3.7
4.3.8
4.3.9
4.3.10
4.3.11
4.3.12
4.3.13
4.3.14
4.4
4.4.1
1138I–FPSLI–1/08
Clock Options
RX1
TX1
XTAL1
XTAL2
TOSC1
TOSC2
SCL
SDA
Crystal Oscillator
Input (receive) to UART(1) – See SCR53
Output (transmit) from UART(1) – See SCR53
Input to the inverting oscillator amplifier and input to the internal clock operating circuit.
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
ceramic resonator may be used.
Figure 4-1.
Oscillator Connections
HC
MAX 1 HC BUFFER
C2
C1
AT94KAL Series FPSLIC
GND
XTAL2
XTAL1
R
Figure
BIAS
4-1. Either a quartz crystal or a
C2 = 27 pf
C1 = 33 pf
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