AT88SA10HS-TSU-T(2010) データシートの表示（PDF） - Atmel Corporation
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AT88SA10HS-TSU-T Datasheet PDF : 23 Pages
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Atmel AT88SA10HS Host Authentication Chip
The total BurnSecure execution delay is directly proportional to the total number of fuses being burned. If VCC is
less than 4.5V, then the total BurnSecure execution time may exceed the interval remaining before the expiration
of the watchdog timer. In this case, the BurnSecure command should be run repeatedly, with each repetition
burning only as many fuses as there is time available. The system software is responsible for counting the
number of ‘1’ bits in the clear-text version of the map parameter sent to the chip – no error is returned if the fuse
burn count is too high. Other than Fuse[87] (see below), the fuses may be burned in any order.
Prior to execution of BurnSecure, Atmel® AT88SA10HS verifies that Fuse[87] is un-burned. If it has been burned,
then the BurnSecure command will return an error. Fuse[87] must be burned during the last repetition of
BurnSecure, optionally in combination with other fuses.
There are a series of very small intervals during tEXEC_SECURE when the fuse element is actually being burned. The
power supply must not be removed during this interval and the watchdog timer must not be allowed to expire
during this interval, or the fuse may end up in a state where it reads as un-burned but cannot be burned.
Table 5-13. Input Parameters
Name
Opcode
BURNSECURE
Param1
Decrypt
Param2
BurnTime
Data
Map
Size Notes
1 0x10
1 If one, decrypt Map data before usage. If zero, the map is transmitted in plain text
2 Must be 0x00 00 if VCC > 4.5V, must be 0x80 00 otherwise
11 Which fuses to burn, may be encrypted
Table 5-14. Output Parameters
Name
Size Notes
Success
1
Upon successful execution, a value of zero will be returned by Atmel AT88SA10HS
This command takes a constant time to execute regardless of the number of fuses being burned.
5.7.
PauseShort
Forces the chip into a busy mode for a period of tPAUSE. During execution of this command the chip will ignore all
activity on the IO signal. This command is used to prevent bus conflicts in a system that also includes one or
more Atmel AT88SA100S or Atmel AT88SA102S client chips sharing the same signal wire.
Table 5-15. Input Parameters
Name
Opcode
PAUSESHORT
Param1
Ignored
Param2
Ignored
Data
Ignored
Size Notes
1 0x00
1 Must be 0x00
2 Must be 0x00 00
0
Table 5-16. Output Parameters
Name
Size Notes
Success
1
After a delay of tPAUSE, the Atmel AT88SA10HS will return a value of zero in response to a
Transmit flag
17
8595F–SMEM–8/10
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