ATmega165 datasheet(248/336 Pages) ATMEL

248 / 336 page

248

ATmega165/V

2573G–AVR–07/09

Notes:

1. The SPIEN Fuse is not accessible in serial programming mode.

2. The default value of BOOTSZ1..0 results in maximum Boot Size. See Table 96 on

page 244 for details.

3. See “Watchdog Timer Control Register – WDTCR” on page 43 for details.

4. Never ship a product with the OCDEN Fuse programmed regardless of the setting of

Lock bits and JTAGEN Fuse. A programmed OCDEN Fuse enables some parts of the

clock system to be running in all sleep modes. This may increase the power

consumption.

5. If the JTAG interface is left unconnected, the JTAGEN fuse should if possible be dis-

abled. This to avoid static current at the TDO pin in the JTAG interface.

Notes:

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

source. See Table 16 on page 38 for details.

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

Table 6 on page 26 for details.

3. The CKOUT Fuse allow the system clock to be output on PORTE7. See “Clock Out-

put Buffer” on page 29 for details.

4. See “System Clock Prescaler” on page 29 for details.

Table 102. Fuse High Byte

Fuse High

Byte

Bit

Description

Default Value

OCDEN(4)

Enable OCD

1 (unprogrammed, OCD

disabled)

JTAGEN(5)

Enable JTAG

0 (programmed, JTAG

enabled)

SPIEN(1)

Enable Serial Program and Data

Downloading

0 (programmed, SPI prog.

enabled)

WDTON(3)

Watchdog Timer always on

1 (unprogrammed)

EESAVE

EEPROM memory is preserved

through the Chip Erase

1 (unprogrammed, EEPROM

not preserved)

BOOTSZ1

Select Boot Size (see Table 96 for

details)

0 (programmed)(2)

BOOTSZ0

Select Boot Size (see Table 96 for

details)

0 (programmed)(2)

BOOTRST

Select Reset Vector

1 (unprogrammed)

Table 103. Fuse Low Byte

Fuse Low Byte

Bit No

Description

Default Value

CKDIV8(4)

Divide clock by 8

0 (programmed)

CKOUT(3)

Clock output

1 (unprogrammed)

SUT1

Select start-up time

1 (unprogrammed)(1)

SUT0

Select start-up time

0 (programmed)(1)

CKSEL3

Select Clock source

0 (programmed)(2)

CKSEL2

Select Clock source

0 (programmed)(2)

CKSEL1

Select Clock source

1 (unprogrammed)(2)

CKSEL0

Select Clock source

0 (programmed)(2)

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