Atmel AVR AT90S8515-4 Spécifications télécharger pdf (Page 84)

AT90S8515

0841G–09/01

Bit 5 = SPIEN Fuse bit

Bit 0 = FSTRT Fuse bit

Bit 7-6, 4-1 = “1”. These bits are reserved and should be left unprogrammed (“1”).

3. Give WR a t

WLWH_PFB

-wide negative pulse to execute the programming,

WLWH_PFB

is found in Table 30. 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” on page 81 for details on command and data loading):

1. A: Load Command “0010 0000”.

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

Bit 2 = Lock Bit2

Bit 1 = Lock Bit1

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

3. E: 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” on page 81 for details on Command loading):

1. A: Load Command “0000 0100”.

2. Set OE

to “0”, and BS to “1”. The status of the Fuse and Lock bits can now be

read at DATA (“0” means programmed).

Bit 7 = Lock Bit1

Bit 6 = Lock Bit2

Bit 5 = SPIEN Fuse bit

Bit 0 = FSTRT Fuse bit

3. Set OE

to “1”.

Observe that BS needs to be set to “1”.

Reading the Signature Bytes The algorithm for reading the signature bytes is as follows (refer to “Programming the

Flash” on page 81 for details on command and address loading):

1. A: Load Command “0000 1000”.

2. C: Load Address Low Byte ($00 - $02).

Set OE

to “0”, and BS to “0”. The selected signature byte can now be read at DATA.

3. Set OE to “1”.

1 2 ... 79 80 81 82 83 84 85 86 87 88 89 ... 111 112

Commentaires sur ces manuels

Pas de commentaire

Atmel AVR AT90S8515-4 Spécifications Page 84

Commentaires sur ces manuels

Produits connexes et manuels pour Mise en réseau Atmel AVR AT90S8515-4