Freescale Semiconductor StarCore SC140 - Manual (Page 319)

DSP Core Instruction Set
SC140 DSP Core Reference Manual A-5
A.1.2 Addressing Mode Notation
Table A-5 and Table A-6 define the fields in the address offset or post increment tables, which are found in
the instruction field section of an instruction definition. EA stands for effective address. A different field in
the opcode (RRR) determines what register is used for Rn.
EA MMM Effective Address Notation
ea MM Effective Address Notation
000 (Rn+N0) 010 (Rn) 100 (Rn)+N0 110 (Rn)+N2
001 (Rn)– 011 (Rn)+ 101 (Rn)+N1 111 (Rn)+N3
Table A-5. Addressing Mode Notation for the EA Operand
Addressing Mode Definition Notation in the Instruction Field
Indexed by offset in N0 (Rn + N0)
Post decrement (Rn)–
No update (Rn)
Post increment (Rn)+
Post update by offset in N0 (Rn) + N0
Post update by offset in N1 (Rn) + N1
Post update by offset in N2 (Rn) + N2
Post update by offset in N3 (Rn) + N3
Note: Rn is taken from the Rn (RRR) table found in the instruction definition.
00 ( Rn )+ 01 ( Rn )– 10 ( Rn +N0) 11 ( Rn )
Table A-6. Addressing Mode Notation for the ea Operand
Addressing Mode Definition Notation in Instruction Field
Indexed by offset in N0 (Rn + N0)
Post decrement (Rn)–
No update (Rn)
Post increment (Rn)+
Note: Rn is taken from the Rn (RRR) table found in the instruction definition.