ATmega32HVB datasheet(209/273 Pages) ATMEL

209 / 273 page

209

8042A–AVR–07/09

ATmega16HVB/32HVB

Notes:

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

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

30.2

Fuse Bits

The ATmega16HVB/32HVB has two Fuse bytes. Table 30-4 and Table 30-3 describe briefly the

functionality of all the fuses and how they are mapped into the Fuse byte. Note that the fuses are

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

30.2.1

High Byte

Notes:

1. The default DUVRDINIT should not be changed. DUVRDINIT= “1” is reserved for future use.

2. The default value of BOOTSZ1:0 results in maximum Boot Size.

BLB1

Mode

BLB12

BLB11

No restrictions for SPM or LPM accessing the Boot Loader section.

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

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.

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 30-2.

Lock Bit Protection Modes

(1)(2) (Continued)

Memory Lock Bits

Protection Type

Table 30-3.

Fuse High Byte

Bit No

Fuse High Byte

Description

Default Value

7:5

–

DUVRDINIT(1)

Reset Value of DUVRDRegister

0 (programmed)

DWEN

Enable debugWire

1 (unprogrammed)

BOOTSZ1

Select Boot Size

0 (programmed)(2)

BOOTSZ0

Select Boot Size

0 (programmed)(2)

BOOTRST

Select Reset Vector

1 (unprogrammed)

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