ATAES132-SH-ER Atmel, ATAES132-SH-ER Datasheet - Page 20

• Manufacturer Part Number: ATAES132-SH-ER
• Description: EEPROM AES 32Kbit EE I2C
• Manufacturer: Atmel

Specifications of ATAES132-SH-ER

• Rohs: yes
• Maximum Clock Frequency: 1 MHz
• Operating Supply Voltage: 6 V
• Maximum Operating Temperature: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SOIC-8
• Interface Type: I2C
• Factory Pack Quantity: 2300

4.4.
Monontonic Counter Configuration
The CounterConfig register imposes restrictions on the usage of the counter command with a counter (See Section 7.5). There
is one CounterConfig register for each counter. Each counter can increment up to a value of 2,097,134 using the count
command; after which they can be no longer changed. See Appendix H for additional counter information.
The CounterConfig bits have no impact on the functionality of a Key Usage Counter. If a Counter is identified in a KeyConfig
register (see Section 4.2) as a Key Usage Counter, then the Counter will increment each time the Key is used. The
CounterConfig[CntID].IncrementOK bit is typically set to 0b to prohibit the Counter Command from incrementing a Key usage
Counter.
Table 4-8.
Note:
CounterConfig Field
IncrementOK
RequireMAC
Reserved
IncrID
MacID
1.
2.
Definition of the CounterConfig register bits
Changes to the CounterConfig registers take effect immediately, allowing the functionality to be verified during
the personalization process
Warning:
protect the customer secrets. See Section 7.19 for the lock command.
The Atmel ATAES132 must always be locked by the customer prior to shipment to the end user to
Byte
0
0
0
1
1
2 to 7
0 to 3
4 to7
Bit
0
1
Description
If 1b, then increments using the counter command are permitted
If 0b, then increments using the counter command are prohibited
If 1b, then the increment operation requires an input MAC
If 0b, then an input MAC is prohibited
Reserved for future use. All bits must be 0b.
KeyID of the key used to generate the counter command input MAC for increment
operations
KeyID of the key used to generate the counter command output MAC for counter
read operations
(1)(2)
Atmel ATAES132 Preliminary Datasheet
8760A−CRYPTO−5/11
20