ATMEGA8U2_14 Datasheet, PDF (34/310 Pages) ATMEL Corporation – 125 Powerful Instructions – Most Single Clock Cycle Execution

ATmega8U2/16U2/32U2
Notes: 1. The device is shipped with this option selected.
2. The frequency ranges are preliminary values. Actual values are TBD.
3. If 8 MHz frequency exceeds the specification of the device (depends on V_CC), the CKDIV8
Fuse can be programmed in order to divide the internal frequency by 8.
When this Oscillator is selected, start-up times are determined by the SUT Fuses as shown in
Table 8-5 on page 31.
Table 8-7. Start-up times for the internal calibrated RC Oscillator clock selection
Power Conditions
BOD enabled
Start-up Time from Power-
down and Power-save
6 CK
Additional Delay from
Reset (V_CC = 5.0V)
14 CK
Fast rising power
Slowly rising power
6 CK
6 CK
14 CK + 4.1 ms
14 CK + 65 ms⁽¹⁾
Reserved
SUT1..0
00
01
10
11
Note: 1. The device is shipped with this option selected.
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