Intel 8XC196MC User Manual page 526

SP
The system's stack pointer (SP) can point anywhere in internal or external memory; it must be word
aligned and must always be initialized before use. The stack pointer is decremented before a PUSH
and incremented after a POP, so the stack pointer should be initialized to two bytes (in 64-Kbyte
mode) or four bytes (in 1-Mbyte mode) above the highest stack location. If stack operations are not
being performed, locations 18H and 19H may be used as standard registers.
15
Bit
Number
15:0 Stack Pointer
This register makes up the system's stack pointer.
Stack Pointer
Function
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REGISTERS
Address: 18H
Reset State: XXXXH
0
C-49
SP