eZ80
®
CPU
User Manual
UM007714-0908 CPU Instruction Set
246
MLT rr
Multiply Register
Operation
rr[15:0] ← rr[15:8] x rr[7:0]
Description
The
rr
operand is any of the multibyte CPU registers BC, DE, or HL. The
MLT
instruc-
tion performs an 8-bit by 8-bit multiply operation. The
rr
operand Low byte is multiplied
by the
rr
operand High byte. The 16-bit product is written back into the 16-bit
rr
register
pair. The MLT instruction performs an 8-bit by 8-bit multiply operation with a 16-bit
result, regardless of the ADL mode.
Condition Bits Affected
None.
Attributes
Mnemonic Operand ADL Mode Cycle Opcode (hex)
MLT BC X 6 ED 4C
MLT DE X 6 ED 5C
MLT HL X 6 ED 6C
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