ATSHA204 datasheet(5/65 Pages) ATMEL

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Atmel ATSHA204 [DATASHEET]

8740D

−CRYPTO−3/12

2.1.1

Configuration Zone

The 88 bytes in the configuration zone contain manufacturing identification data, general device and system configuration, and

access restriction control values for the slots within the data zone. The values of these bytes can always be obtained using the

Read command. The bytes of this zone are arranged as shown in Table 2-1.

Table 2-1.

Configuration Zone

Byte #

Name

Description

Write

Read

 3

SN[0:3]

Part of the serial number value

See the Section 2.1.1.2, “Special Memory Values in the Config Zone (Bytes 0

– 12)”

Never

Always

 7

RevNum

Device revision number

See the Section 2.1.1.2, “Special Memory Values in the Config Zone (Bytes 0

– 12)”

Never

Always

 12

SN[4:8]

Part of the serial number value

See the Section 2.1.1.2, “Special Memory Values in the Config Zone (Bytes 0

– 12)”

Never

Always

Reserved

Set by Atmel

Never

Always

I2C_Enable

Bit 0:

0 = the device operates in single-wire interface mode

1 = the device operates in I

2C interface mode

Bits 1-7 are ignored:

These bits are set at the Atmel factory, depending on the part number, and

cannot be changed.

Never

Always

Reserved

Set by Atmel

Never

Always

I2C_Address

Bit 0: Ignored

Bits 1-7: For I

2C interface parts, the most-significant seven bits of this byte

form the device address value to which this device will respond. Bits 1, 2, and

4-7 are ignored for single-wire interface parts.

Bit 3 (TTLenable):

1 = the input levels are VCC referenced

0 = the input levels use a fixed reference

See Section 7.4.1 for more information.

For devices in which the I

2C interface is enabled this byte has a default value

of 0xC9 on shipment from Atmel.

If config

unlocked

Always

RFU

Reserved for future use, must be written to 0x00.

If config

unlocked

Always

OTPmode

0xAA (Read-only mode) = Writes to the OTP zone are forbidden when the

OTP zone is locked. Reads of all words are permitted.

0x55 (Consumption mode) = Not supported at this time

Contact Atmel for more information.

0x00 (Legacy mode) = When the OTP zone is locked, writes to the OTP zone,

reads of words 0 and 1, and 32-byte reads are all forbidden. See Section 9 for

more information on compatibility with the Atmel AT88SA102S device.

All other values of OTP mode are reserved and should not be used.

If config

unlocked

Always

SelectorMode

If 0, then Selector can always be written with UpdateExtra.

If non-zero, Selector can only be written if it currently has a value of zero.

See Section 8.13 for more details.

If config

unlocked

Always

 51

SlotConfig

Two bytes of access and usage permissions and controls for each slot of the

data zone. See the SlotConfig (Bytes 20 – 51) section below for more details.

If config

unlocked

Always

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