Legend (table 1), Table 2. bp1 to bp4 protection code assignments – Rainbow Electronics MAX66020 User Manual

Page 6

MAX66020

ISO/IEC 14443 Type B-Compliant
1Kb Memory Fob

_______________________________________________________________________________________

AFFECTED MEMORY AREA

CONTROLLING

BLOCKS

00h TO 03h

BLOCKS

04h TO 07h

BLOCKS

08h TO 0Bh

BLOCKS

0Ch TO 0Fh

APPLICATION

DATA FIELD

AFI U1

S-LOCK

BP1 E,

W — — — — — — —

BP2 —

— — — —

—

BP3 — —

— — —

—

BP4 — — —

W — —

—

ADF-Lock

— — — — W — — —

AFI-Lock

— — — — — W — —

U1-Lock

— — — — — — W —

S-Lock — — — — — — — W

Table 1. Memory Protection Matrix

CODE DESCRIPTION

E ERPOM-Emulation

Mode

W Write

Protection

Legend (Table 1):

CODE DESCRIPTION

00000000b
(00h)

Unlocked (factory default)

00001010b
(0Ah)

EPROM-Emulation Mode (irreversible)
BP1: blocks 00h to 03h
BP2: blocks 04h to 07h
BP3: blocks 08h to 0Bh
BP4: blocks 0Ch to 0Fh

1010b
(Axh)

Write-Protect Block Mode. Once set to Ah, the upper nibble cannot be changed to any other
value (irreversible). The bits of the lower nibble can still be changed only from 0 (unlocked) to 1
(locked) to write protect blocks individually.
b0: block 00h (BP1), block 04h (BP2), block 08h (BP3), block 0Ch (BP4)
b1: block 01h (BP1), block 05h (BP2), block 09h (BP3), block 0Dh (BP4)
b2: block 02h (BP1), block 06h (BP2), block 0Ah (BP3), block 0Eh (BP4)
b3: block 03h (BP1), block 07h (BP2), block 0Bh (BP3), block 0Fh (BP4)

Table 2. BP1 to BP4 Protection Code Assignments

If programmed to a locking (protecting) code, the controlling register irreversibly protects itself from further changes. See Tables 2

and 3 for additional details.

Note: Do not program the upper nibble of BP4 to 9 or 5, because this blocks the read access to blocks 0Ch to 0Fh.

CODE DESCRIPTION

00000000b (00h)

Unlocked (factory default)

10101010b (AAh)

Locked (irreversible)

All other codes

Unlocked

Table 3. Protection Code Assignments for ADF-Lock, AFI-Lock, U1-Lock, S-Lock