ST ST10 Series - DPP Override Mechanism

Standard Instruction Set PROGRAMMING MANUAL
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1.1.3 DPP override mechanism
The DPP override mechanism temporarily bypasses the DPP addressing scheme.
The EXTP(R) and EXTS(R) instructions override this addressing mechanism. Instruction
EXTP(R) replaces the content of the respective DPP register, while instruction EXTS(R)
concatenates the complete 16-bit long address with the specified segment base address.
The overriding page or segment may be specified directly as a constant (#pag, #seg) or by a
word GPR (Rw).
Figure 2 Overriding the DPP mechanism
0
15
14 13
16-bit Long Address
#pag
14-bit page offset
24-bit Physical Address
0
15
16-bit Long Address
#seg
16-bit segment offset
24-bit Physical Address
EXTP(R):
EXTS(R):