Atmel ATmega328P Xplained Mini MEGA328P-XMINI MEGA328P-XMINI Data Sheet

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ATmega48A/PA/88A/PA/168A/PA/328/P [DATASHEET]

Atmel-8271H-AVR- ATmega-Datasheet_08/2014

Note:

1.

The default value of SUT1...0 results in maximum start-up time for the default clock source. See 

 for details.

2.

The default setting of CKSEL3...0 results in internal RC Oscillator @ 8MHz. See 

 for 

details.

3.

The CKOUT Fuse allows the system clock to be output on PORTB0. See 

details.

4.

See 

 for details.

The status of the Fuse bits is not affected by Chip Erase. Note that the Fuse bits are locked if Lock bit1 (LB1) is 
programmed. Program the Fuse bits before programming the Lock bits.

The fuse values are latched when the device enters programming mode and changes of the fuse values will 
have no effect until the part leaves Programming mode. This does not apply to the EESAVE Fuse which will 
take effect once it is programmed. The fuses are also latched on Power-up in Normal mode.

All Atmel microcontrollers have a three-byte signature code which identifies the device. This code can be read in 
both serial and parallel mode, also when the device is locked. The three bytes reside in a separate address 
space. For the ATmega48A/PA/88A/PA/168A/PA/328/P the signature bytes are given in 

The ATmega48A/PA/88A/PA/168A/PA/328/P has a byte calibration value for the Internal RC Oscillator. This 
byte resides in the high byte of address 0x000 in the signature address space. During reset, this byte is 
automatically written into the OSCCAL Register to ensure correct frequency of the calibrated RC Oscillator.

CKSEL2

2

Select Clock source

0 (programmed)

CKSEL1

1

Select Clock source

1 (unprogrammed)

CKSEL0

0

Select Clock source

0 (programmed)

Fuse Low Byte (Continued)

ATmega48A

0x1E

0x92

0x05

ATmega48PA

0x1E

0x92

0x0A

ATmega88A

0x1E

0x93

0x0A

ATmega88PA

0x1E

0x93

0x0F

ATmega168A

0x1E

0x94

0x06

ATmega168PA

0x1E

0x94

0x0B

ATmega328

0x1E

0x95

0x14

ATmega328P

0x1E

0x95

0x0F