ATMEGA16-16AU SL602 Atmel, ATMEGA16-16AU SL602 Datasheet - Page 261

• Manufacturer Part Number: ATMEGA16-16AU SL602
• Manufacturer: Atmel

Latching of Fuses
Signature Bytes
Calibration Byte
2466T–AVR–07/10
Table 106. Fuse Low Byte
Notes:
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 three-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 ATmega16 the signature bytes are:
1. $000: $1E (indicates manufactured by Atmel)
2. $001: $94 (indicates 16 Kbytes Flash memory)
3. $002: $03 (indicates ATmega16 device when $001 is $94)
The ATmega16 stores four different calibration values for the internal RC Oscillator. These bytes
resides in the signature row High Byte of the addresses 0x0000, 0x0001, 0x0002, and 0x0003
for 1 MHz, 2 MHz, 4 MHz, and 8 Mhz respectively. During Reset, the 1 MHz value is automati-
cally loaded into the OSCCAL Register. If other frequencies are used, the calibration value has
to be loaded manually, see
Fuse Low
Byte
BODLEVEL
BODEN
SUT1
SUT0
CKSEL3
CKSEL2
CKSEL1
CKSEL0
1. The default value of SUT1..0 results in maximum start-up time.
2. The default setting of CKSEL3..0 results in internal RC Oscillator @ 1 MHz. See
details.
page 25
No.
Bit
7
6
5
4
3
2
1
0
for details.
Description
Brown-out Detector trigger level
Brown-out Detector enable
Select start-up time
Select start-up time
Select Clock source
Select Clock source
Select Clock source
Select Clock source
“Oscillator Calibration Register – OSCCAL” on page 30
Default Value
1 (unprogrammed)
1 (unprogrammed, BOD disabled)
1 (unprogrammed)
0 (programmed)
0 (programmed)
0 (programmed)
0 (programmed)
1 (unprogrammed)
(1)
(2)
(2)
(2)
SeeTable 10 on page 29
ATmega16(L)
(1)
(2)
for details.
Table 2 on
261
for