AT89C5131A-RDTUM datasheet(40/184 Pages) ATMEL

40 / 184 page

AT89C5130A/31A-M

4337C–USB–02/05

Table 41. 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 42

and Table 43.

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 43.

Mnemonic

Description

Default value

SBV

Software Boot Vector

FCh

–

HSB

Copy of the Hardware

Security Byte

1011 1000b

–

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

AT89C5130A/31A-M 32

Kbyte

–

Copy of the Device ID #3:

Name

EFh

AT89C5130A/31A-M 32

Kbyte, revision 0

Table 42. Software Security Byte (SSB)

7654

3210

------

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 43

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