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AT88SC101

Smart Card ICs 1K E2PROM with Security Logic

Atmel Corporation 

Table 5. AT88SC101/102 Micro Instructions

Instruction

Bit

Word

READ

WRITE ( WRITE 0)

ERASE (WRITE 1)

RESET

n INC;position counter

on bit

RESET

n INC; position counter

on bit

WRITE0

INC; go to next bit

WRITE0;...

—

—

—

RESET

n INC;position counter on

first bit in word

WRITE 1

n INC;position counter on

first bit in next word

WRITE 1...

CMP

• SECURITY

CODE

CMP

• ERASE KEYS

RESET

79 INC; position counter on

bit preceding SC

16 CMP; verify security code

n INC;If none of the 1st

4 bits of the SCAC is 1,

—

then 4 unsuccessful

attempts have been

made to verify SC,

and the device is

inoperable. If any of the

1st 4 bits is a 1, then:

WRITE 0

WRITE 1; Reset the SCAC

RESET

n INC;position counter on bit

preceding access

—

code or erase key

n CMP;verify access code or

erase key

; n = 32 or 48 bits

Application Zone

—

—

Global

(When Fuse 2 =

1)

—

RESET

n INC; n = 1392 (101)

n = 1440 (102)

WRITE 0

verify erase keys

AT88SC101 Zone 1/88SC102 Zone 2:

RESET

32 CMP

n INC; n = 1232 (101), n = 1280 (102)

VERIFY 1; verify 1 in EC

WRITE 0; write 0 in EC

WRITE 1; erase application zone

RESET

n INC; n = 1392 (101)

n = 1440 (102)

WRITE 1

AT88SC102 Zone 1:

RESET

48 CMP

n INC; n = 736

WRITE 1; erase application zone

—

—

—

—

6

AT88SC101/102

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