AT89C5131A-RDTIL datasheet(39/186 Pages) ATMEL

39 / 186 page

AT89C5131A-L

4338F–USB–08/07

Table 39. Software Registers

After programming the part by ISP, the BSB must be cleared (00h) in order to allow the

application to boot at 0000h.

The content of the Software Security Byte (SSB) is described in Table 40

and Table 41.

To assure code protection from a parallel access, the HSB must also be at the required

level.

The two lock bits provide different levels of protection for the on-chip code and data,

when programmed as shown to Table 41.

Address

Mnemonic

Description

Default value

SBV

Software Boot Vector

FFh

–

BSB

Boot Status Byte

0FFh

–

SSB

Software Security Byte

FFh

–

Copy of the Manufacturer

Code

58h

Atmel

–

Copy of the Device ID #1:

Family Code

D7h

C51 X2, Electrically

Erasable

–

Copy of the Device ID #2:

Memories

F7h

AT89C5131A-L 32 Kbyte

–

Copy of the Device ID #3:

Name

DFh

AT89C5131A-L 32 Kbyte,

revision 0

Table 40. Software Security Byte (SSB)

LB1

LB0

Bit

Number

Bit

Mnemonic

Description

Reserved

Do not clear this bit.

Reserved

Do not clear this bit.

Reserved

Do not clear this bit.

Reserved

Do not clear this bit.

Reserved

Do not clear this bit.

Reserved

Do not clear this bit.

1-0

LB1-0

User Memory Lock Bits

See Table 41

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