DSP Core Reference Manual

Address Generation Unit
SC140 DSP Core Reference Manual 2-43
Table 2-19 summarizes the memory address alignment rule for each type of memory access.
Table 2-19. Memory Address Alignment
2.3.3.7 Addressing Modes Summary
Table 2-20 provides a summary of the addressing modes described in the previous sections. The Operand
Reference columns are abbreviated as follows:
• S = Software Stack Reference in data memory (uses NSP or ESP according to mode)
• C = Program Control Unit Register Reference
• D = DALU Register Reference
• A = AGU Register Reference
• P = Program Memory Reference
• X = Data Memory Reference
Access Type Aligned Address
Byte access Any address
Word access Multiple of 2
Long-word access Multiple of 4
Two long-word access Multiple of 8
Table 2-20. Addressing Modes Summary
Addressing Modes
R0-R7
Uses
MCTL
Operand Reference
Assembler Syntax
SCDAPX
Register Direct
Data or Control Register — √√ Dn
Dn Dm
Dn Dm Di Dj
MCTL
SR, EMR, VBA
LC0, LC1
LC2, LC3
SA0, SA1
SA2, SA3
Address Register (Rn) — √ Rn
Address Modifier Register (Mj) — √ Mj
Base Address Register (Bn) — √ Bn
Address Offset Register (Ni) — √ Ni
Stack Pointer — √ SP