AT88SC0404C-PI Atmel, AT88SC0404C-PI Datasheet - Page 53

• 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

9.4.7. System READ: $B6
52
Functional
Figure 28. System READ Command Functional Description
The System Read command allows reading of the system data from the device. Depending on the value of the P1
parameter, the host may read the data in the configuration memory, the fuses, or a checksum.
Table 42. System READ Command Detail
Read Config Zone
To read 256-bytes, the host should set N = $00. This is true for any outgoing command, and is defined by ISO 7816-3.
If the address provided at P2 is an unauthorized address, the device will return the "Command Unauthorized" code
($69 $00) after it has received the header. Since access rights vary throughout the configuration memory, the host may
provide an authorized starting address, but a number of bytes N that causes the device to reach unauthorized address.
In this case, the device will transmit the authorized bytes, but unauthorized bytes will be replaced by the "fuse byte"
(see below). At the end of this command the "Command Unauthorized" code ($69 $00) will be returned instead of $90
$00 to indicate that some of the bytes returned were not valid.
Read Fuse Byte
Fuse data is returned in the form of a single byte. Bits zero to three represent the fuse states; 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 43. Fuse Byte Definition
Atmel AT88SC0104/0204/0404/0808/1616/3216/6416/12816/25616C
Read Config Zone
Read Fuse Byte
Read Checksum
resv
F
7
resv
Number of bytes N
F
Read Command
6
Address P1
Address P2
Command
Host
resv
F
5
resv
Device
F
Data
Data
4
…
SEC
F
CLA
3
$00
$00
$00
N data bytes
$B6
$B6
$B6
INS
PER
F
2
$00
$01
$02
P1
CMA
F
1
addr
$00
$00
®
P2
.
5211C–SMIC–01/10
FAB
F
$01
$02
0
P3
N