 | Services and Modeling for Embedded Software Development |
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| Services and Modeling for Embedded Software Development |
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Encoding (format 4):
0 | 0 | 1 | 0 | 1 | 1 | 0 | d2 | d1 | d0 | a2 | a1 | a0 | s2 | s1 | s0 |
Syntax:
LDW Rd,(-Ra,S)
Constraints:
Outcome:
Notes:
For the avoidance of doubt, the decrement of Ra is carried out before Ra is used to compute the address for loading.
This opcode accesses data memory, and the computed address is therefore a byte address. Accessing a non-existent memory location will trigger a bus error exception.
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| 3.5.5. LDB: Indexed Load Byte with Predecrement |  | 3.5.7. STB: Indexed Store Byte |