ATmega16 datasheet(256/315 Pages) ATMEL

256 / 315 page

256

ATmega16(L)

2466E–AVR–10/02

Notes:

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

28 for details.

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

Table 2 on page 23 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 has a byte calibration value for the internal RC Oscillator. This byte

resides in the high byte of address $000 in the signature address space. During reset,

this byte is automatically written into the OSCCAL register to ensure correct frequency

of the calibrated RC Oscillator.

Table 105. 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)

ATMEGA16 Datasheet(PDF) 256 Page - ATMEL Corporation

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