Rainbow-electronics ATmega64C1 Manuel d'utilisateur télécharger pdf (Page 290)

290

7647A–AVR–02/08

ATmega32/64/M1/C1

Notes: 1. Program the Fuse bits and Boot Lock bits before programming the LB1 and LB2.

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

24.2 Fuse Bits

The ATmega32/64/M1/C1 has three Fuse bytes. Table 24-4 - Table 24-7 describe briefly the

functionality 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 24-3. Lock Bit Protection Modes

(1)(2)

BLB0 Mode BLB02 BLB01

111

No restrictions for SPM or LPM accessing the Application

section.

2 1 0 SPM is not allowed to write to the Application section.

300

SPM is not allowed to write to the Application section, and LPM

executing from the Boot Loader section is not allowed to read

from the Application section. If Interrupt Vectors are placed in

the Boot Loader section, interrupts are disabled while executing

from the Application section.

401

LPM executing from the Boot Loader section is not allowed to

read from the Application section. If Interrupt Vectors are placed

in the Boot Loader section, interrupts are disabled while

executing from the Application section.

BLB1 Mode BLB12 BLB11

111

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.

300

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.

401

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.

Table 24-4. Extended Fuse Byte

Extended Fuse Byte Bit No Description Default Value

- 7 - 1 (unprogrammed)

- 6 - 1 (unprogrammed)

PSCRB 5 PSC Reset Behaviour 1 (unprogrammed)

PSCRVA 4 PSCOUTnA Reset Value 1 (unprogrammed)

PSCRVB 3 PSCOUTnB Reset Value 1 (unprogrammed)

1 2 ... 285 286 287 288 289 290 291 292 293 294 295 ... 365 366

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Rainbow-electronics ATmega64C1 Manuel d'utilisateur Page 290

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