IP2022 User’s Manual—Instruction Set Architecture www.ubicom.com 121 Example: page  0x600 ;set page bits
call  addxy ;call subroutine addxy
nop    ;addxy results ;available here ... addxy: ;subroutine address label
mov    w,#0F ;subroutine begins
add    w,0x099 ... ret    ;return from subroutine The  call  instruction  in  this  example  calls  a
subroutine   called   addxy.   When   the   call
instruction   is   executed,   the   address   of   the
following   instruction   (the   nop   instruction)   is
pushed onto the stack and the program jumps to
the addxy routine. When the ret instruction is
executed, the 16-bit program address saved on
the stack is popped and restored to the program
counter,  which  causes  the  program  to  continue
with   the   instruction   immediately   following   the call instruction.