Nexcom DNA 1120 - Bypass Control Register Bit Definitions; Bypass Timer Configuration Register

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Appendix B: Bypass Specifications
DNA 1120/1120A User Manual
Bypass Control Register Bit Definitions
Bypass Timer Configuration Register
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.
Bit Field 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 ex-
pired
Read only bit:
0 = Timer has not expired
1 = Timer has expired
Note: A read operation on Bypass Timer Configuration Reg-
ister should not cause the timer value to refresh.