Rainbow-electronics ATmega8515L Bedienungsanleitung PDF herunterladen (Seite 177)

177

ATmega8515(L)

2512A–AVR–04/02

Notes: 1. The defaultvalue ofSUT1..0 results in maximum start-up time. See Table13 on page

36 fordetails.

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

Table5onpage 32 fordetails.

The status of the Fuse bits is not affectedbyChipErase. Note that the Fuse bits are

locked ifLock bit1 (LB1) isprogrammed.Program the Fuse bitsbefore programming the

Lock bits.

Latching of Fuses The fusevalues are latchedwhen the deviceenters Programming modeandchanges of

the fusevalueswill havenoeffectuntil the part leaves Programming mode. Thisdoes

not apply to the EESAVEFuse which will takeeffectonceitisprogrammed.The fuses

arealso latched on Power-up in Normal mode.

Signature Bytes All Atmel microcontrollers have a 3-byte signature code which identifies the device. This

code can be read in bothSerial and Parallel mode, also when the deviceislocked.The

three bytesresideinaseparate address space.

For the ATmega8515 the signature bytes are:

1. $000:$1E(indicates manufacturedbyAtmel).

2. $001: $93 (indicates 8KB Flash memory).

3. $002:$06(indicates ATmega8515 device when $001 is $93).

Calibration Byte The ATmega8515 has aone-byte calibration value for theinternal RCOscillator.This

byte resides in the highbyte of address $000inthe signatureaddress space. During

reset, thisbyte is automatically written into the OSCCAL Register to ensure correct fre-

quency of the calibrated RCOscillator.

Table 84. Fuse LowByte

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 source0(programmed)

(2)

CKSEL22Select Clock source0(programmed)

(2)

CKSEL11Select Clock source0(programmed)

(2)

CKSEL00Select Clock source1(unprogrammed)

(2)

1 2 ... 172 173 174 175 176 177 178 179 180 181 182 ... 222 223

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