| MIL-STD-1750A: Standard sixteen-bit computer architecture | ||
|---|---|---|
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Addr
Mode Mnemonic Format/Opcode
8 4 4 16
D LUB RA,ADDR --------------------------------------
DX LUB RA,ADDR,RX | 8B | RA | RX | | ADDR |
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8 4 4 16
I LUBI RA,ADDR --------------------------------------
IX LUBI RA,ADDR,RX | 8D | RA | RX | | ADDR |
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Description. The MSH (upper byte) of the Derived Operand, DO, is loaded into the LSH (lower byte) of register RA. The MSH (upper byte) of RA is unaffected. The condition status, CS, is set based on the result in RA.
Register Transfer Description.
(RA)8-15 <-- DO0-7;
(CS) <-- 0010 if (RA) = 0;
(CS) <-- 0001 if (RA) < 0;
(CS) <-- 0100 if (RA) > 0;
Registers Affected. RA, CS