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0
X
0
SFTRST
0
X
Bit 0: Software Issued Reset (SFTRST).
A zero-to-one transition causes the register space in the DS26502 to be cleared. A
reset clears all configuration and status registers. The bit automatically clears itself when the reset has completed.
Bits 1 to 3: Unused, must be set = 0 for proper operation.
Bits 4 and 5: Test Mode Bits (TEST0, TEST1).
Test modes are used to force the output pins of the DS26502 into known
states. This can facilitate the checkout of assemblies during the manufacturing process and also be used to isolate devices from
shared buses.
TEST1
0
0
1
1
TEST0
0
1
0
1
Effect On Output Pins
Operate normally
Force all output pins into tri-state (including all I/O pins and parallel port pins)
Force all output pins low (including all I/O pins except parallel port pins)
Force all output pins high (including all I/O pins except parallel port pins)
Bits 6 and 7: Unused, must be set = 0 for proper operation.
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