Rainbow-electronics ATmega64C1 Manual de usuario descargar pdf (Pagina 292)

292

7647A–AVR–02/08

ATmega32/64/M1/C1

Note: 1. See “Alternate Functions of Port C” on page 71 for description of RSTDISBL Fuse.

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

3. See “Watchdog Timer Configuration” on page 53 for details.

4. The default value of BOOTSZ1..0 results in maximum Boot Size. See Table 24-8 on page 294

for details

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

See Table 5-9 on page 36 for details.

2. The default setting of CKSEL3..0 results in internal RC Oscillator @ 8 MHz. See Table 5-9 on

page 36 for details.

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

Buffer” on page 36 for details.

4. See “System Clock Prescaler” 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.

24.3.1 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

Table 24-6. Fuse High Byte

High Fuse Byte Bit No Description Default Value

RSTDISBL

(1)

7 External Reset Disable 1 (unprogrammed)

DWEN 6 debugWIRE Enable 1 (unprogrammed)

SPIEN

(2)

Enable Serial Program and

Data Downloading

0 (programmed, SPI

programming enabled)

WDTON

(3)

4 Watchdog Timer Always On 1 (unprogrammed)

EESAVE 3

EEPROM memory is

preserved through the Chip

Erase

1 (unprogrammed), EEPROM

not reserved

BOOTSZ1 2

Select Boot Size

(see Table 113 for details)

0 (programmed)

(4)

BOOTSZ0 1

Select Boot Size

(see Table 113 for details)

0 (programmed)

(4)

BOOTRST 0 Select Reset Vector 1 (unprogrammed)

Table 24-7. Fuse Low Byte

Low Fuse Byte Bit No Description Default Value

CKDIV8

(4)

7 Divide clock by 8 0 (programmed)

CKOUT

(3)

6 Clock output 1 (unprogrammed)

SUT1 5 Select start-up time 1 (unprogrammed)

(1)

SUT0 4 Select start-up time 0 (programmed)

(1)

CKSEL3 3 Select Clock source 0 (programmed)

(2)

CKSEL2 2 Select Clock source 0 (programmed)

(2)

CKSEL1 1 Select Clock source 1 (unprogrammed)

(2)

CKSEL0 0 Select Clock source 0 (programmed)

(2)

1 2 ... 287 288 289 290 291 292 293 294 295 296 297 ... 365 366

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