AT88SC0404C-PI Atmel, AT88SC0404C-PI Datasheet - Page 36

• Manufacturer Part Number: AT88SC0404C-PI
• Manufacturer: Atmel

Specifications of AT88SC0404C-PI

• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Package Type: PDIP
• Mounting: Through Hole
• Pin Count: 8
• Operating Temperature Classification: Industrial
• Lead Free Status / RoHS Status: Not Compliant

7.6.4. System Read: $B6
5211C–SMIC–01/10
Atmel AT88SC0104/0204/0404/0808/1616/3216/6416/12816/25616C
Functional
Figure 18. System Read Command Functional Description
The System Read command allows reading of system data from the device. Depending on the value of Address 1, the
host may read the data in the configuration memory, the fuses or a checksum.
Table 30. System Read Command Detail
Read Config Zone
The data byte address to be read is defined by Address 2 in the command and is internally incremented following the
transmission of each data byte. The value N defines how many bytes Atmel
will result in 256-bytes read. If the address provided is an unauthorized address, the device will not ACK the N-byte and
will not return any data. Since access rights vary throughout the configuration memory, the host may provide an
authorized starting address and a number of bytes N that causes the device to reach unauthorized address. In this
case the device will transmit the fuse byte (see below) in place of unauthorized bytes.
Read Fuse Byte
Fuse data is returned in the form of a single byte. Bits zero to three represent the fuse state. A value of ‘0’ indicates the
fuse has been blown. Bits four to seven are not used as security fuses and are reserved by Atmel.
Table 31. Fuse Byte Definition
Read Config Zone
Read Fuse Byte
Read Checksum
resv
F
7
resv
Number of bytes N
F
Read Command
6
Command Description
Address 1
Address 2
Host
resv
F
5
resv
Device
F
Data
Data
4
…
SEC
F
3
N data bytes
Command
$B6
$B6
$B6
®
CryptoMemory
PER
F
2
Addr 1
$00
$01
$02
®
will read, a value of zero
CMA
F
1
Addr 2
addr
$00
$00
FAB
F
$01
$02
0
N
N
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