
26
Chapter 2 Addressing Modes
dsp:8[SP]
Stack pointer relative
dsp
dsp
SP
Register
Memory
If the dsp value is negative
If the dsp value is positive
address
2.3 General Instruction Addressing
The address indicated by the content of stack
pointer (SP) plus the value indicated by
displacement (dsp)—added including the sign
bits—constitutes the effective address to be
operated on. The stack pointer (SP) here is
the one indicated by the U flag.
However, if the addition resulted in exceeding
0000016- 0FFFF16, the bits above bit 17 are
ignored, and the address returns to 0000016
or 0FFFF16.
This addressing can be used in MOV
instruction.
Comentarios a estos manuales