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STW Store Word to Memory With a 5-Bit Unsigned Constant Offset or Register Offset
3-246 Instruction Set SPRU733
Increments and decrements default to 1 and offsets default to zero when no
bracketed register or constant is specified. Stores that do no modification to
the baseR can use the syntax *R. Square brackets, [ ], indicate that the ucst5
offset is left-shifted by 2. Parentheses, ( ), can be used to set a nonscaled,
constant offset. For example, STW (.unit) src, *+baseR(12) represents an
offset of 12 bytes; whereas, STW (.unit) src, *+baseR[12] represents an offset
of 12 words, or 48 bytes. You must type either brackets or parentheses around
the specified offset, if you use the optional offset parameter.
Word addresses must be aligned on word (two LSBs are 0) boundaries.
Execution if (cond) src
→ mem
else nop
Pipeline
Stage
E1
Read baseR, offsetR, src
Written baseR
Unit in use
.D2
Instruction Type Store
Delay Slots 0
For more information on delay slots for a store, see Chapter 4.
See Also STB, STH
Example STW .D1 A1,*++A10[1]
Before
instruction
1 cycle after
instruction
3 cycles after
instruction
A1
9A32 7634h
A1 9A32 7634h A1 9A32 7634h
A10 0000 0100h A10 0000 0104h A10 0000 0104h
mem 100h 1111 1134h mem 100h 1111 1134h mem 100h 1111 1134h
mem 104h 0000 1111h mem 104h 0000 1111h mem 104h 9A32 7634h
Pipeline