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 

Fuse Bits

ATmega64(L)

Table 117. Lock Bit Protection Modes(2) (Continued)

Memory Lock Bits

Protection Type

1

1

1

No restrictions for SPM or LPM accessing the Boot Loader

section.

2

1

0

SPM is not allowed to write to the Boot Loader section.

3

0

0

SPM is not allowed to write to the Boot Loader section,

and LPM executing from the Application section is not

allowed to read from the Boot Loader section. If Interrupt

Vectors are placed in the Application section, interrupts

are disabled while executing from the Boot Loader section.

4

0

1

LPM executing from the Application section is not allowed

to read from the Boot Loader section. If Interrupt Vectors

are placed in the Application section, interrupts are

disabled while executing from the Boot Loader section.

Notes: 1. Program the Fuse bits before programming the Lock bits.

2. “1” means unprogrammed, “0” means programmed

The ATmega64 has three fuse bytes. Table 118 - Table 120 describe briefly the func-

tionality of all the fuses and how they are mapped into the fuse bytes. Note that the

fuses are read as logical zero, “0”, if they are programmed.

Table 118. Extended Fuse Byte

Fuse Low Byte

–

–

–

–

–

–

M103C(1)

WDTON(2)

Bit no

7

6

5

4

3

2

1

0

Description

–

–

–

–

–

–

ATmega103 compatibility mode

Watchdog Timer always on

Default Value

1

1

1

1

1

1

0 (programmed)

1 (unprogrammed)

Notes: 1. See “ATmega103 and ATmega64 Compatibility” on page 4 for details.

2. See “Watchdog Timer Control Register – WDTCR” on page 55 for details.

2490G–AVR–03/04

291

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