Motorola DSP56800 Manual page 315

IMPY(16)
Condition Codes Affected:
15 14
LF *
Instruction Fields:
Operation
IMPY(16)
Timing:
2 oscillator clock cycles
Memory:
1 program word
Integer Multiply
MR
13 12 11 10 9
* * * * I1
E — Not defined
U — Not defined
N — Set if bit 35 of the result is set except during saturation
Z — Set if the 20 MSBs of the result equal zero
V — Set if overflow occurs in the 16-bit result
Operands C
Y1,X0,FDD 2
Y0,X0,FDD
Y1,Y0,FDD
Y0,Y0,FDD
A1,Y0,FDD
B1,Y1,FDD
Instruction Set Details
CCR
8 7 6 5 4
E U N
I0 SZ L
W
1 Integer 16x16 multiply with 16-bit result.
When the destination register is F, the F0 portion is
unchanged by the instruction.
Note: Assembler also accepts first two operands
when they are specified in opposite order.
IMPY(16)
3 2 1 0
Z V
C
Comments
A-85