Rainbow-electronics ATmega8515L Manual de usuario descargar pdf (Pagina 176)

176

ATmega8515(L)

2512A–AVR–04/02

Notes: 1. Program the Fuse bitsbefore programming the Lock bits.

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

Fuse Bits The ATmega8515 has two Fuse bytes.Table83 and Table84describe briefly the func-

tionality of all the fuses andhow they aremapped into the fuse bytes. Note that the

Fuses are read aslogicalzero, “0”, if they are programmed.

Notes: 1. See “AT90S4414/8515 CompatibilityMode” on page 4 fordetails.

2. The SPIEN Fuseis not accessibleinserialprogramming mode.

3.The CKOPT Fuse functionalitydepends on the setting of the CKSEL bits. See “Clock

Sources”onpage 32. fordetails.

4. The defaultvalue ofBOOTSZ1..0 results in maximum Boot Size. See Table 78on

page 173.

BLB1 Mode BLB12 BLB11

111

No restrictionsforSPM orLPM accessing the Boot Loader

section.

210SPM is not allowed to write to the Boot Loadersection.

3 00

SPM is not allowed to write to the Boot Loadersection,

andLPM executing from theApplication section is not

allowed to readfrom the Boot Loadersection. If Interrupt

Vectors are placed in theApplication section, interrupts

are disabledwhileexecuting from the Boot Loadersection.

401

LPM executing from theApplication section is not allowed

to readfrom the Boot Loadersection. If InterruptVectors

are placed in theApplication section, interrupts are

disabledwhileexecuting from the Boot Loadersection.

Table 82. Lock Bit Protection Modes

(2)

(Continued)

Memory Lock Bits Protection Type

Table 83. Fuse HighByte

Fuse High Byte Bit no Description Default Value

S8515C7

AT 90S4414/8515 compatibility

mode

1 (unprogrammed)

WDTON 6 Watchdog Timer always on 1 (unprogrammed)

SPIEN

(1)(2)

Enable Serial Program andData

Downloading

0 (programmed, SPIprog.

enabled)

CKOPT

(3)

4 Oscillator options 1 (unprogrammed)

EESAVE3

EEPROM memory ispreserved

through the ChipErase

1 (unprogrammed,

EEPROM not preserved)

BOOTSZ12

Select Boot Size (see Table 78 for

details) 0 (programmed)

(4)

BOOTSZ01

Select Boot Size (see Table 78 for

details) 0 (programmed)

(4)

BOOTRST0SelectReset Vector 1 (unprogrammed)

1 2 ... 171 172 173 174 175 176 177 178 179 180 181 ... 222 223

Comentarios a estos manuales

Sin comentarios

Rainbow-electronics ATmega8515L Manual de usuario Pagina 176

Comentarios a estos manuales

Relacionado con productos y manuales para Sensores Rainbow-electronics ATmega8515L