MF1ICS50 datasheet(9/20 Pages) NXP

9 / 20 page

MF1ICS50_001056

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Product data sheet

PUBLIC

Rev. 5.6 — 24 November 2010

001056

9 of 20

NXP Semiconductors

MF1ICS50

Functional specification

• Adr: Signifies a 1-byte address, which can be used to save the storage address of a

block, when implementing a powerful backup management. The address byte is

stored four times, twice inverted and non-inverted. During increment, decrement,

restore and transfer operations the address remains unchanged. It can only be

altered via a write command.

6.6.3 Sector trailer (block 3)

Each sector has a sector trailer containing the

• secret keys A and B (optional), which return logical “0”s when read and

• the access conditions for the four blocks of that sector, which are stored in bytes 6...9.

The access bits also specify the type (read/write or value) of the data blocks.

If key B is not needed, the last 6 bytes of block 3 can be used as data bytes.

Byte 9 of the sector trailer is available for user data. For this byte the same access rights

as for byte 6, 7 and 8 apply.

All keys are set to FFFFFFFFFFFFh at chip delivery.

Fig 6.

Value blocks

Byte Number

Description

Adr

Value

Adr

Fig 7.

Sector trailer

Byte Number

Description

Key A

Access Bits

Key B (optional)

MF1ICS50 Datasheet(PDF) 9 Page - NXP Semiconductors