atam862-8 ATMEL Corporation, atam862-8 Datasheet - Page 29

• Manufacturer Part Number: atam862-8
• Description: Atam862-8 Microcontroller With Uhf Ask/fsk Transmitter
• Manufacturer: ATMEL Corporation

19.2.4
19.2.5
4590G–4BMCU–06/07
4-MHz Oscillator
32-kHz Oscillator
Figure 19-4. RC-oscillator 2
The microcontroller block 4-MHz oscillator options need a crystal or ceramic resonator con-
nected to the OSC1 and OSC2 pins to establish oscillation. All the necessary oscillator circuitry
is integrated, except the actual crystal, resonator, C3 and C4.
Figure 19-5. 4-MHz Crystal Oscillator
Figure 19-6. Ceramic Resonator
Some applications require long-term time keeping or low resolution timing. In this case, an
on-chip, low power 32-kHz crystal oscillator can be used to generate both the SUBCL and the
SYSCL. In this mode, power consumption is greatly reduced. The 32-kHz crystal oscillator can
not be stopped while the power-down mode is in operation.
Configurable
C3
C4
Configurable
V
*
R
OSC1
OSC2
4 MHz
DD
XTAL
ext
OSC1
OSC2
*
OSC1
OSC2
Cer.
Res
C1
C2
*
*
R
Trim
oscillator 2
C1
*
*
C2
Oscin
Oscout
oscillator
RC
4-MHz
Oscout
Oscin
RcOut2
oscillator
Stop
4-MHz
4Out
Stop
4Out
Stop
Osc-Stop
RcOut2
Osc-Stop
Osc-Stop
4Out
4Out
ATAM862-8
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