ATMEGA64L-8MI View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATMEGA64L-8MI

8-bit AVR® Microcontroller with 64K Bytes In-System Programmable Flash

Atmel Corporation 

Table 119. Fuse High Byte

Fuse High Byte Bit no Description

OCDEN

7 Enable OCD

JTAGEN(4)

6 Enable JTAG

SPIEN(1)

CKOPT(2)

EESAVE

BOOTSZ1

BOOTSZ0

BOOTRST

5 Enable SPI Serial Program and

Data Downloading

4 Oscillator options

3 EEPROM memory is preserved

through the Chip Erase

2 Select Boot Size (see Table 113

for details)

1 Select Boot Size (see Table 113

for details)

0 Select Reset Vector

Default Value

1 (unprogrammed, OCD

disabled)

0 (programmed, JTAG

enabled)

0 (programmed, SPI prog.

enabled)

1 (unprogrammed)

1 (unprogrammed,

EEPROM not preserved)

0 (programmed)(3)

0 (programmed)(3)

1 (unprogrammed)

Notes:

1. The SPIEN Fuse is not accessible in SPI Serial Programming mode.

2. The CKOPT Fuse functionality depends on the setting of the CKSEL bits. See “Clock

Sources” on page 36 for details.

3. The default value of BOOTSZ1..0 results in maximum Boot Size. See Table 113 on

page 289

4. 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

Table 120. Fuse Low Byte

Fuse Low Byte

BODLEVEL

BODEN

Bit no

7

6

Description

Brown out detector trigger

level

Brown out detector enable

SUT1

SUT0

CKSEL3

CKSEL2

CKSEL1

CKSEL0

5 Select start-up time

4 Select start-up time

3 Select Clock source

2 Select Clock source

1 Select Clock source

0 Select Clock source

Default Value

1 (unprogrammed)

1 (unprogrammed, BOD

disabled)

1 (unprogrammed)(1)

0 (programmed)(1)

0 (programmed)(2)

0 (programmed)(2)

0 (programmed)(2)

1 (unprogrammed)(2)

Notes:

1. The default value of SUT1..0 results in maximum start-up time. See Table 14 on page

40 for details.

2. The default setting of CKSEL3..0 results in internal RC Oscillator @ 1 MHz. See

Table 6 on page 36 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.

292 ATmega64(L)

2490G–AVR–03/04

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