AT88SC153 データシートの表示（PDF） - Atmel Corporation

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AT88SC153

3 x 64 x 8 Secure Memory with Authentication

Atmel Corporation 

Command Definitions and Protocols

Table 9. Device Commands

The communications protocol is based on the popular two-wire serial interface. Note

that the most significant bit is transmitted first.

Command

Description

Chip Select

Instruction

b7

b6

b5

b4

b3

b2

b1

b0

Write EEPROM

CS3

CS2

CS1

CS0

z

z

0

0

Read EEPROM

CS3

CS2

CS1

CS0

z

z

0

1

Verify Password

CS3

CS2

CS1

CS0

r

p

1

1

Initialize Authentication

CS3

CS2

CS1

CS0

0

0

1

0

Verify Authentication

CS3

CS2

CS1

CS0

0

1

1

0

Write Fuse

CS3

CS2

CS1

CS0

1

0

1

0

Read Fuse

CS3

CS2

CS1

CS0

1

1

1

0

Note: r : Read/write password

p : Password set

Read EEPROM

Figure 4. Read EEPROM

Write EEPROM

Note: *don’t care bit

zz: Zone number

The data byte address is internally incremented following the transmission of each data

byte. During a read operation, the address “roll over” is from the last byte of the current

zone to the first byte of the same zone. If the host is not allowed to read at the specified

address, the device will transmit the corresponding data byte with all bits equal to “0”.

Figure 5. Write EEPROM

Note: *don’t care bit

zz: Zone number

10 AT88SC153

1016D–SMEM–04/04

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