PCIF0 datasheet(238/294 Pages) ATMEL

238 / 294 page

238

9219A–RFID–01/11

Atmel ATA5505 [Preliminary]

Notes:

1. The default value of SUT1..0 results in maximum start-up time for the default clock source.

See Table 4-4 on page 31 for details.

2. The default setting of CKSEL3..0 results in internal RC Oscillator at 8MHz. See Table 4-3 on

page 31 for details.

3. The CKOUT Fuse allows the system clock to be output on PORTB5. See ”Clock Output Buf-

fer” on page 35. for details.

4. See ”System Clock Prescaler” on page 41.for details.

22.2.1

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.

22.3

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.

Table 22-5.

Fuse Low Byte

Bit No

Description

Default Value

CKDIV8(4)

Divide clock by 8

0 (programmed)

CKOUT(3)

Clock output

1 (unprogrammed)

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

1 (unprogrammed)(2)

CKSEL0

Select Clock source

0 (programmed)(2)

Table 22-6.

Signature Bytes

Device

Address

Value

Signature Byte Description

Atmel AVR®

0x1E

Indicates manufactured by Atmel

0x94

Indicates 16 KB Flash memory

0x87

Indicates

Atmel AVR device when address 1 contains

0x94

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