ATmega16 datasheet(261/357 Pages) ATMEL

261 / 357 page

261

2466S–AVR–05/09

ATmega16(L)

Notes:

1. The default value of SUT1..0 results in maximum start-up time. SeeTable 10 on page 29 for

details.

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

page 25 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.

Signature Bytes

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:

$000: $1E (indicates manufactured by Atmel)

$001: $94 (indicates 16KB Flash memory)

$002: $03 (indicates ATmega16 device when $001 is $94)

Calibration Byte

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, 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 – OSCCAL” on page 30 for details.

Table 106. Fuse Low Byte

Fuse Low

Byte

Bit

No.

Description

Default Value

BODLEVEL

Brown-out Detector trigger level

1 (unprogrammed)

BODEN

Brown-out Detector enable

1 (unprogrammed, BOD disabled)

SUT1

Select start-up time

1 (unprogrammed)(1)

SUT0

Select start-up time

0 (programmed)(1)

CKSEL3

Select Clock source

0 (programmed)(2)

CKSEL2

Select Clock source

0 (programmed)(2)

CKSEL1

Select Clock source

0 (programmed)(2)

CKSEL0

Select Clock source

1 (unprogrammed)(2)

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