ATMEGA48V_11 ATMEL [ATMEL Corporation], ATMEGA48V_11 Datasheet - Page 34

• Manufacturer Part Number: ATMEGA48V_11
• Description: 8-bit Atmel Microcontroller with 4/8/16K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

9.7
2545T–AVR–05/11
128kHz internal oscillator
Table 9-8.
Notes:
When this Oscillator is selected, start-up times are determined by the SUT Fuses as shown in
Table
Table 9-9.
Note:
The 128kHz internal oscillator is a low power oscillator providing a clock of 128kHz. The fre-
quency is nominal at 3V and 25°C. This clock may be select as the system clock by
programming the CKSEL fuses to “11” as shown in
Table 9-10.
Note:
When this clock source is selected, start-up times are determined by the SUT Fuses as shown in
Table
Table 9-11.
Note:
Power conditions
BOD enabled
Fast rising power
Slowly rising power
BOD enabled
Fast rising power
Slowly rising power
Power conditions
9-9.
9-11.
1. The device is shipped with this option selected.
2. If 8MHz frequency exceeds the specification of the device (depends on V
1. If the RSTDISBL fuse is programmed, this start-up time will be increased to
2. The device is shipped with this option selected.
1. Note that the 128kHz oscillator is a very low power clock source, and is not designed for a high
1. If the RSTDISBL fuse is programmed, this start-up time will be increased to
Fuse can be programmed in order to divide the internal frequency by 8.
14CK + 4.1ms to ensure programming mode can be entered.
accuracy.
14CK + 4.1ms to ensure programming mode can be entered.
Frequency range (MHz)
Internal calibrated RC oscillator operating modes
Start-up times for the internal calibrated RC Oscillator clock selection.
128kHz internal oscillator operating modes.
Start-up times for the 128kHz internal oscillator.
7.3 - 8.1
Nominal frequency
128kHz
power-down and power-save
power-down and power-save
Start-up time from
Start-up time from
Reserved
Reserved
6CK
6CK
6CK
6CK
6CK
6CK
Table
9-10.
Additional delay from
Additional delay from
ATmega48/88/168
reset (V
(1)(2)
14CK + 65ms
14CK + 4.1ms
14CK + 64ms
14CK + 4ms
.
CKSEL3..0
14CK
14CK
reset
0010
CC
CKSEL3..0
(1)
= 5.0V)
(1)
0011
(2)
CC
), the CKDIV8
SUT1..0
SUT1..0
00
01
10
11
00
01
10
11
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