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