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96
Rabbit 2000/3000 Microprocessor
Description
A signed multiplication operation is performed on the contents of the 16-bit binary integers contained in the
BC and DE registers. The signed 32-bit result is placed in HL (bits 31 through 16) and BC (bits 15 through 0)
registers.
Examples:
LD BC, 0FFFFh
;BC gets -1
LD DE, 0FFFFh
;DE gets -1
MUL
;HL|BC = 1, HL gets 0000h, BC gets 0001h
In the above example, the 2’s complement of FFFFh is 0001h.
LD BC, 0FFFFh
;BC gets -1
LD DE, 00001h
;DE gets 1
MUL
;HL|BC = -1, HL gets FFFFh, BC gets FFFFh
MUL
Opcode
Instruction
Clocks
Operation
F7
MUL
12 (2,10)
HL:BC = BC • DE
Flags
ALTD
I/O
S
Z
L/V
C
F
R
SP
S
D
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Summary of Contents for 2000
Page 2: ...ii Rabbit 2000 3000 Microprocessor...
Page 4: ...iv Rabbit 2000 Microprocessor...
Page 16: ...12 Rabbit 2000 3000 Microprocessor...
Page 164: ...160 Instruction Reference Manual...