42 www.ubicom.com IP2022 Data Sheet Figure 4-14  Stack Operation on Subroutine Return For    program    bugs    involving    stack    underflow,    the
instruction   at   byte   address   0x1FFFE   (word   address
0xFFFF) can be used to jump to an appropriate handler.
For   example,   system   recovery   may   be   possible   by
jumping  to  the  reset  vector  at  byte  address  0x1FFE0
(word address 0xFFF0). 515-011.eps Stack 1 Stack 2 Program Counter (15:0)   Stack 16 Contents
Loaded with 0xFFFF Stack 3 Stack 4 Stack 5 Stack 6 Stack 7 Stack 8 Stack 9 Stack 10 Stack 11 Stack 12 Stack 13 Stack 14 Stack 15 Stack 16