Some event initiates the subroutine for loading {HEAD ~ data} into {TAIL ~ shift} register 10, or conversely, for reading data out of the shift register, such as an impeding power interruption as discussed previously 
into
Some event initiates the subroutine for loading { HEAD ~ data } into { TAIL ~ shift } register 10 , or conversely , for reading data out of the shift register , such as an impeding power interruption as discussed previously
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH