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Appendix C: Bypass Specifications
Bypass Control Register Bit Definitions
Bit Field
Bypass Timer Configuration Register F2
Bit Field
Name
Value
2:0
Timer value
000 = 0 second, timer immediately expired
001 = 1 second
010 = 2 seconds
011 = 4 seconds
100 = 8 seconds
101 = 16 seconds
110 = 32 seconds
111 = 64 seconds
Note: This is a write only field.
Upon reads these bit values are undefined.
A Timer value of 1 to 7 is required to be written before
expiration of the hardware timer. When the timer expires,
all segments which have been enabled in bits 2:0 of Power
ON state Bypass Control Status Register set relays closed
to form bypass segments. It is the responsibility of the
software to keep track of the time to ensure writes to this
register occur no greater than TimerValueInSeconds / 2. A
write of the timer value will automatically reset the expiration timer and set it to the value expressed in bit 2:0.
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91
Name
Value
3
Not used
No activity taken if written, value is undetermined and not
needed on read operation.
4
Not used
No activity taken if written, value is undetermined and not
needed on read operation.
5
Not used
No activity taken if written, value is undetermined and not
needed on read operation.
6
Not used
No activity taken if written, value is undetermined and not
needed on read operation.
7
Timer
expired
Read only bit:
0 = Timer has not expired
1 = Timer has expired
Note: A read operation on Bypass Timer Configuration
Register should not cause the timer value to refresh.
NSA 5130 User Manual