AT88SC0104C datasheet(30/58 Pages) ATMEL

30 / 58 page

5210B–SMIC–11/08

AT88SC0104/0204/0404/0808/1616/3216/6416/12816/25616C

• Write Commands: ACK polling required except encrypted write commands. Any command

may be used.

• Set commands: No ACK polling required.

• Verify commands: ACK polling required with B2 or B6 commands only.

The following table lists the specific requirements for ACK polling and the maximum expected

delay before the device will ACK indicating readiness for the next command.

Note:

Delays are based on operation at 25

° C. See Table 10-3 on page 51

7.5

Device Addressing

The first nibble of the command byte corresponds to the device address. All CryptoMemory

devices will respond to the device address $B. A specific device may be set to respond to

another value ($0 to $F) in addition to $B by setting this value in the second nibble of the Device

Configuration Register (DCR) in the configuration memory. The DCR is set to $FF at the Atmel

factory and thus will respond to device address $B and $F unless the DCR is modified. For a

device to respond only to $B the DCR should be set to $B also.

7.6

Command Descriptions

In the following section operations are described in two parts: the instruction is described first

from a functional point of view (parameters and data exchanged), after which they are detailed

for the synchronous two-wire protocol. In these diagrams, values are shown in binary format with

bits to the left transmitted first, i.e. bytes are transmitted most significant bit first.

Table 7-2.

Minimum Delay for ACK Polling for each Command

Command Description

Command

Addr 1

Addr 2

ACK Polling CMD

Delay

Write User Zone

Normal

$B0

addr

Required, any CMD

5ms

Normal with Anti-Tearing

Encrypted

$B0

addr

Required, any CMD

20ms

$B0

addr

No, Send Checksum

Encrypted with Anti-Tearing

$B0

addr

No, Send Checksum

Read User Zone

$B2

addr

Not Required

System Write

Write Config Zone

$B4

$00

addr

Required, any CMD

5ms

Write Fuses

$B4

$01

fuse ID

$00

Required, any CMD

5ms

Set User Zone

$B4

$03

zone

$00

Not Required

Write Config Zone with Anti-

Tearing

$B4

$08

addr

Required, any CMD

20ms

Set User Zone with Anti-

Tearing

$B4

$0B

zone

$00

Not Required

System Read

Read Config Zone

$B6

$00

addr

Not Required

Read Fuse Byte

$B6

$01

$00

$01

Not Required

Verify Password

Write Password

$BA

$0X

$00

$01

Required; B2 or B6 only

10ms

Read Password

$BA

$1X

$00

$03

Required; B2 or B6 only

10ms

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