NEC Network Controller uPD98502 - Manual (Page 62)

CHAPTER 2 V R 4120A
62 Preliminary User’s Manual S15543EJ1V0UM
The following special instructions to load and store data that are not aligned on 4-byte (word) or 8-byte
(doubleword) boundaries:
LWL LWR SWL SWR
LDL LDR SDL SDR
These instructions are used in pairs to provide an access to misaligned data. Accessing misaligned data incurs
one additional instruction cycle over that required for accessing aligned data.
Figure 2-6 shows the access of a misaligned word that has byte address 3 for the little-endian conventions.
Figure 2-6. Misaligned Word Accessing (Little-Endian)
5 6 4
0 15 16 8 23 24 7 31
3
Low-order
address
High-order
address