AT90LS4433-4AI datasheet(91/126 Pages) ATMEL

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AT90S/LS4433

1042H–AVR–04/03

Programming the Fuse Bits

The algorithm for programming the Fuse bits is as follows (refer to “Programming the

Flash” for details on command and data loading):

A: Load Command “0100 0000”.

B: Load Data Low Byte. Bit n = “0” programs and bit n = “1” erases the Fuse bit.

Bit 5 = SPIEN Fuse bit

Bit 4 = BODLEVEL Fuse bit

Bit 3 = BODEN Fuse bit

Bit 2 = CKSEL2 Fuse bit

Bit 1 = CKSEL1 Fuse bit

Bit 0 = CKSEL0 Fuse bit

Bits 7 - 6 = “1”. These bits are reserved and should be left unprogrammed (“1”).

Give WR a t

WLWH_PFB wide negative pulse to execute the programming, tWLWH_PFB

is found in Table 33. Programming the Fuse bits does not generate any activity

on the RDY/BSY pin.

Programming the Lock Bits

The algorithm for programming the Lock bits is as follows (refer to “Programming the

Flash” for details on command and data loading):

A: Load Command “0010 0000”.

B: Load Data Low Byte. Bit n = “0” programs the Lock bit.

Bit 2 = Lock bit 2

Bit 1 = Lock bit 1

Bits 7 - 3, 0 = “1”. These bits are reserved and should be left unprogrammed (“1”).

C: Write Data Low Byte.

The Lock bits can only be cleared by executing Chip Erase.

Reading the Fuse and Lock

Bits

The algorithm for reading the Fuse and Lock bits is as follows (refer to “Programming

the Flash” for details on command loading):

A: Load Command “0000 0100”.

Set OE to “0”, and BS to “0”. The status of the Fuse bits can now be read at

DATA (“0” means programmed).

Bit 5 = SPIEN Fuse bit

Bit 4 = BODLEVEL Fuse bit

Bit 3 = BODEN Fuse bit

Bit 2 = CKSEL2 Fuse bit

Bit 1 = CKSEL1 Fuse bit

Bit 0 = CKSEL0 Fuse bit

Set BS to “1”. The status of the Lock bits can now be read at DATA (“0” means

programmed).

Bit 2 = Lock Bit 2

Bit 1= Lock Bit 1

Set OE to “1”.

AT90LS4433-4AI Datasheet(PDF) 91 Page - ATMEL Corporation

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