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ATmega16-16PU Folha de dados(PDF) 28 Page - ATMEL Corporation

Nome de Peças ATmega16-16PU
Descrição Electrónicos  8-bit Microcontroller with 16K Bytes In-Syustem Programmable Flash
Download  357 Pages
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Fabricante Electrônico  ATMEL [ATMEL Corporation]
Página de início  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega16-16PU Folha de dados(HTML) 28 Page - ATMEL Corporation

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2466S–AVR–05/09
ATmega16(L)
Low-frequency
Crystal Oscillator
To use a 32.768 kHz watch crystal as the clock source for the device, the Low-frequency Crystal
Oscillator must be selected by setting the CKSEL Fuses to “1001”. The crystal should be con-
nected as shown in Figure 12. By programming the CKOPT Fuse, the user can enable internal
capacitors on XTAL1 and XTAL2, thereby removing the need for external capacitors. The inter-
nal capacitors have a nominal value of 36 pF.
When this Oscillator is selected, start-up times are determined by the SUT Fuses as shown in
Table 6.
Note:
1. These options should only be used if frequency stability at start-up is not important for the
application.
External RC
Oscillator
For timing insensitive applications, the external RC configuration shown in Figure 13 can be
used. The frequency is roughly estimated by the equation f = 1/(3RC). C should be at least 22
pF. By programming the CKOPT Fuse, the user can enable an internal 36 pF capacitor between
XTAL1 and GND, thereby removing the need for an external capacitor. For more information on
Oscillator operation and details on how to choose R and C, refer to the External RC Oscillator
application note.
Figure 13. External RC Configuration
The Oscillator can operate in four different modes, each optimized for a specific frequency
range. The operating mode is selected by the fuses CKSEL3..0 as shown in Table 7.
Table 6. Start-up Times for the Low-frequency Crystal Oscillator Clock Selection
SUT1..0
Start-up Time from
Power-down and
Power-save
Additional Delay
from Reset
(V
CC = 5.0V)
Recommended Usage
00
1K CK(1)
4.1 ms
Fast rising power or BOD enabled
01
1K CK(1)
65 ms
Slowly rising power
10
32K CK
65 ms
Stable frequency at start-up
11
Reserved
Table 7. External RC Oscillator Operating Modes
CKSEL3..0
Frequency Range (MHz)
0101
0.1
≤ 0.9
0110
0.9 - 3.0
0111
3.0 - 8.0
1000
8.0 - 12.0
XTAL2
XTAL1
GND
C
R
VCC
NC


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