at88sa102s ATMEL Corporation, at88sa102s Datasheet - Page 21

• Manufacturer Part Number: at88sa102s
• Description: Cryptoauthentication
• Manufacturer: ATMEL Corporation

4.6.
5.
8584A–SMEM–03/09
PauseLong
Forces the chip into a busy mode until the watchdog timer expires, after which it will automatically enter into the pause
state. During execution of this command and while in the pause state the chip will ignore all activity on the IO signal.
This command is used to prevent bus conflicts in a system that also includes other AT88SA102S chips or a
CryptoAuthentication host chip sharing the same signal wire.
Table 19.
Table 20.
The Selector parameter provides a mechanism to select which device will pause if there are multiple devices on the
bus:
Pinout
There are three pins on the chip.
Table 21.
1
2
3
Opcode
Param1
Param2
Data
Success
Pin #
Name
If the Selector parameter is 0x00, then every AT88SA102S chip receiving this command will go into the pause
state and no chip will return a success code.
If any of the bits of the Selector parameter are set, then the chip will read the values of Fuse[84-87] and go
into the pause state only if those fuse values match the least significant 4 bits of the Selector parameter. If the
chip does NOT go into the pause state, it returns an error code of 0x0F. Otherwise it goes into the pause
state and never returns any code.
Signal
V
V
Input Parameters
Output Parameters
Chip Pins
CC
SS
Name
PAUSELONG
Selector
Zero
Ignored
Size
1
Name
IO channel to the system, open drain output. It is expected that an external pull-up resistor
will be provided to pull this signal up to V
in use this pin can be pulled to either V
Power supply, 2.5 – 5.5V. This pin should be bypassed with a high quality 0.1μF capacitor
close to this pin with a short trace to V
www.atmel.com.
Connect to system ground.
If the command indicates that some other chip should go into the pause state, a value of
0x0F will be returned by the AT88SA102S. If this chip goes into the pause state no value
will be returned.
Size
1
1
2
0
0x01
Which chip to put into the pause state, 0x00 for all AT88SA102S chips
Must be 0x00 00
SS
CC
. Additional applications information at
Description
CC
or V
AT88SA102S [Preliminary]
for proper communications. When the chip is not
Notes
SS
.
Notes
21