AT90PWM2 datasheet(281/361 Pages) ATMEL

281 / 361 page

281

4317J–AVR–08/10

AT90PWM2/3/2B/3B

Notes:

1. See “Alternate Functions of Port C” on page 70 for description of RSTDISBL Fuse.

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

3. See “Watchdog Timer Configuration” on page 54 for details.

4. See Table 9-2 on page 48 for BODLEVEL Fuse decoding.

Note:

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

See Table 7-11 on page 37 for details.

2. The default setting of CKSEL3..0 results in internal RC Oscillator @ 8 MHz. See Table 7-11 on

page 37 for details.

3. The CKOUT Fuse allows the system clock to be output on PORTB0. See “Clock Output Buffer”

on page 37 for details.

4. See “System Clock Prescaler” on page 37 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.

25.3.1

Latching of Fuses

The fuse values are latched when the device enters programming mode and changes of the

fuse values will have no effect until the part leaves Programming mode. This does not apply to

the EESAVE Fuse which will take effect once it is programmed. The fuses are also latched on

Power-up in Normal mode.

Table 25-5.

Fuse High Byte

High Fuse Byte

Bit No

Description

Default Value

RSTDISBL(1)

External Reset Disable

1 (unprogrammed)

DWEN

debugWIRE Enable

1 (unprogrammed)

SPIEN(2)

Enable Serial Program and

Data Downloading

0 (programmed, SPI

programming enabled)

WDTON(3)

Watchdog Timer Always On

1 (unprogrammed)

EESAVE

EEPROM memory is

preserved through the Chip

Erase

1 (unprogrammed), EEPROM

not reserved

BODLEVEL2(4)

Brown-out Detector trigger

level

1 (unprogrammed)

BODLEVEL1(4)

Brown-out Detector trigger

level

1 (unprogrammed)

BODLEVEL0(4)

Brown-out Detector trigger

level

1 (unprogrammed)

Table 25-6.

Fuse Low Byte

Low Fuse 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)

AT90PWM2 Datasheet(PDF) 281 Page - ATMEL Corporation

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