Rainbow-electronics ATmega128L Manual de usuario descargar pdf (Pagina 281)

281

ATmega128(L)

2467B–09/01

Notes: 1. The SPIEN fuse is not accessible in serial programming mode.

2. The CKOPT fuse functionality depends on the setting of the CKSEL bits. See

“Clock

Sources” on page 34

for details.

3. The default value of BOOTSZ1..0 results in maximum Boot Size. See Table 113 on

page 277

Notes: 1. The default value of SUT1..0 results in maximum start-up time. See Table 14 on page

38 for details.

2. The default setting of CKSEL3..0 results in internal RC oscillator @ 1 MHz. See

Table 6 on page 34 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.

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 119. Fuse High Byte

Fuse High

Byte Bit No. Description Default Value

OCDEN 7 Enable OCD 1 (unprogrammed, OCD

disabled)

JTAGEN 6 Enable JTAG 0 (programmed, JTAG enabled)

SPIEN

(1)

5 Enable Serial Program and

Data Downloading

0 (programmed, SPI prog.

enabled)

CKOPT

(2)

4 Oscillator options 1 (unprogrammed)

EESAVE 3 EEPROM memory is preserved

through the Chip Erase

1 (unprogrammed, EEPROM not

preserved)

BOOTSZ1 2 Select Boot Size (see Table 113

for details)

0 (programmed)

(3)

BOOTSZ0 1 Select Boot Size (see Table 113

for details)

0 (programmed)

(3)

BOOTRST 0 Select reset vector 1 (unprogrammed)

Table 120. Fuse Low Byte

Fuse Low

Byte Bit No. Description Default Value

BODLEVEL 7 Brown out detector trigger level 1 (unprogrammed)

BODEN 6 Brown out detector enable 1 (unprogrammed, BOD disabled)

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 0 (programmed)

(2)

CKSEL0 0 Select Clock source 1 (unprogrammed)

(2)

1 2 ... 276 277 278 279 280 281 282 283 284 285 286 ... 330 331

Comentarios a estos manuales

Sin comentarios

Rainbow-electronics ATmega128L Manual de usuario Pagina 281

Comentarios a estos manuales

Relacionado con productos y manuales para Sensores Rainbow-electronics ATmega128L