Sthu - IBM PPC440X5 CPU Core User Manual

Preliminary

sthu

Store Halfword with Update
sthu RS, D(RA)
45
0 6
EA (RA|0) + EXTS(D)
MS(EA, 2) (RS)
16:31
(RA) EA
An effective address (EA) is formed by adding a displacement to a base address. The displacement is
obtained by sign-extending the 16-bit D field to 32 bits. The base address is 0 when the RA field is 0, and is
the contents of register RA otherwise.
The least significant halfword of register RS is stored into the halfword at the EA.
The EA is placed into register RA.
Registers Altered
• RA
Invalid Instruction Forms
RA = 0
instrset.fm.
September 12, 2002
RS RA
11
PPC440x5 CPU Core User's Manual
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sthu
Store Halfword with Update
D
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