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ATMEGA16-16MC Datasheet(PDF) 27 Page - ATMEL Corporation

Part No. ATMEGA16-16MC
Description  8-bit AVR Microcontroller with 16K Bytes In-System Programmable Flash
Download  315 Pages
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Maker  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
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ATMEGA16-16MC Datasheet(HTML) 27 Page - ATMEL Corporation

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27
ATmega16(L)
2466E–AVR–10/02
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
frequencies 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 external 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 MHz Oscillator frequency selected, this calibration gives a fre-
quency within ± 1% of the nominal frequency. 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 calibration value, see the
section “Calibration Byte” on page 256.
Note:
1. The device is shipped with this option selected.
Table 7. External RC Oscillator Operating Modes
CKSEL3..0
Frequency Range (MHz)
0101
≤ 0.9
0110
0.9 - 3.0
0111
3.0 - 8.0
1000
8.0 - 12.0
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


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