; any write reference to any register stores current time into all registers
; read references don't change anything
; time is seconds-and-microseconds, per gettimeofday().
; register addresses
clk_usec_l == {8}171230 ; microseconds, low word
clk_usec_h == {8}171232 ; microseconds, high word
clk_sec_l  == {8}171234 ; seconds, low word
clk_sec_h  == {8}171236 ; seconds, high word