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ATmega16-16PU Arkusz danych(PDF) 29 Page - ATMEL Corporation

Numer części ATmega16-16PU
Szczegółowy opis  8-bit Microcontroller with 16K Bytes In-Syustem Programmable Flash
Download  357 Pages
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Producent  ATMEL [ATMEL Corporation]
Strona internetowa  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega16-16PU Arkusz danych(HTML) 29 Page - ATMEL Corporation

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29
2466S–AVR–05/09
ATmega16(L)
When this Oscillator is selected, start-up times are determined by the SUT Fuses as shown in
Table 8.
Note:
1. This option should not be used when operating close to the maximum frequency of the device.
Calibrated Internal
RC Oscillator
The Calibrated Internal RC Oscillator provides a fixed 1.0, 2.0, 4.0, or 8.0 MHz clock. All fre-
quencies are nominal values at 5V and 25
⋅C. This clock may be selected as the sys-tem clock
by programming the CKSEL Fuses as shown in Table 9. If selected, it will operate with no exter-
nal components. The CKOPT Fuse should always be unpro-grammed when using this clock
option. During Reset, hardware loads the calibration byte into the OSCCAL Register and
thereby automatically calibrates the RC Oscillator. At 5V, 25
⋅C and 1.0, 2.0, 4.0 or 8.0 MHz
Oscillator frequency selected, this calibration gives a frequency within ± 3% of the nominal fre-
quency. Using calibration methods as described in application notes available at
www.atmel.com/avr it is possible to achieve ±1% accuracy at any given V
CC and Temperature.
When this Oscillator is used as the Chip Clock, the Watchdog Oscillator will still be used for the
Watchdog Timer and for the reset time-out. For more information on the pre-programmed cali-
bration value, see the section “Calibration Byte” on page 261.
Note:
1. The device is shipped with this option selected.
When this Oscillator is selected, start-up times are determined by the SUT Fuses as shown in
Table 10. XTAL1 and XTAL2 should be left unconnected (NC).
Note:
1. The device is shipped with this option selected.
Table 8. Start-up Times for the External RC 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
18 CK
BOD enabled
01
18 CK
4.1 ms
Fast rising power
10
18 CK
65 ms
Slowly rising power
11
6 CK(1)
4.1 ms
Fast rising power or BOD enabled
Table 9. Internal Calibrated RC Oscillator Operating Modes
CKSEL3..0
Nominal Frequency (MHz)
0001(1)
1.0
0010
2.0
0011
4.0
0100
8.0
Table 10. Start-up Times for the Internal Calibrated RC 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
6 CK
BOD enabled
01
6 CK
4.1 ms
Fast rising power
10(1)
6 CK
65 ms
Slowly rising power
11
Reserved


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