ATMEGA8515L8AU ATMEL Corporation, ATMEGA8515L8AU Datasheet - Page 181

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ATMEGA8515L8AU

Manufacturer Part Number
ATMEGA8515L8AU
Description
TQFP44
Manufacturer
ATMEL Corporation
Datasheet

Specifications of ATMEGA8515L8AU

Date_code
10+
Latching of Fuses
Signature Bytes
Calibration Byte
2512J–AVR–10/06
Table 84. Fuse Low Byte
Fuse Low Byte
Bit no
Description
Brown-out Detector trigger
BODLEVEL
7
level
BODEN
6
Brown-out Detector enable
SUT1
5
Select start-up time
SUT0
4
Select start-up time
CKSEL3
3
Select Clock source
CKSEL2
2
Select Clock source
CKSEL1
1
Select Clock source
CKSEL0
0
Select Clock source
Notes:
1. The default value of SUT1..0 results in maximum start-up time. See Table 13 on page
39 for details.
2. The default setting of CKSEL3..0 results in internal RC Oscillator @ 1 MHz. See
Table 5 on page 35 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.
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.
All Atmel microcontrollers have a 3-byte signature code which identifies the device. This
code can be read in both Serial and Parallel mode, also when the device is locked. The
three bytes reside in a separate address space.
For the ATmega8515 the signature bytes are:
1. $000: $1E (indicates manufactured by Atmel).
2. $001: $93 (indicates 8KB Flash memory).
3. $002: $06 (indicates ATmega8515 device when $001 is $93).
The ATmega8515 stores four different calibration values for the internal RC Oscillator.
These bytes resides in the signature row high byte of the addresses 0x000, 0x0001,
0x0002, and 0x0003 for 1, 2, 4, and 8 MHz respectively. During Reset, the 1 MHz value
is automatically loaded into the OSCCAL Register. If other frequencies are used, the
calibration value has to be loaded manually, see “Oscillator Calibration Register – OSC-
CAL” on page 39 for details.
ATmega8515(L)
Default value
1 (unprogrammed)
1 (unprogrammed, BOD
disabled)
(1)
1 (unprogrammed)
(1)
0 (programmed)
(2)
0 (programmed)
(2)
0 (programmed)
(2)
0 (programmed)
(2)
1 (unprogrammed)
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