AT90SCR100 datasheet(380/433 Pages) ATMEL

380 / 433 page

380

TPR0327AY–SMS–30Jan09

AT90SCR100

Notes: 1. The CKOUT Fuse allow the system clock to be output on PORTB1. See “Clock Output Buffer”

on page 40 for details.

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

See Table 7-3 on page 35 for details.

3. These values are fixed. They used to select clocks that are not available for AT90SCR100.

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.

29.2.1

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.

29.3

Signature Bytes

29.3.1

Device and JTAG IDs

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. The AT90SCR100 signature bytes are given in Table

29-6.

29.3.2

Serial Number

The Serial Number is composed of 9 bytes. You can only read these bytes. They are pro-

grammed during probe sessions and are unique for each die. They are composed of:

• SN0: Chip ID: same for all AT90SCR100 ICs

• SN1: Silicon Revision

Table 29-5.

Fuse Low Byte

Bit No

Description

Default Value

-7

CKOUT(1)

Clock output

1 (unprogrammed)

SUT1

Select start-up time

1 (unprogrammed)(2)

SUT0

Select start-up time

0 (programmed)(2)

CKSEL3

Select Clock source

1 (unprogrammed)

-2

0 (3)

-1

0 (3)

CKSEL0

Select Clock source

1 (unprogrammed)

Table 29-6.

Device and JTAG ID

Part

Signature Bytes Address

JTAG

0x000

0x001

0x002

Part Number

Manufacture ID

AT90SCR100

0x1E

0x96

0x09

96C1

0x1F

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