at94k10al ATMEL Corporation, at94k10al Datasheet - Page 113

• Manufacturer Part Number: at94k10al
• Description: At94k05al 5k - 40k Gates Of At40k Fpga With 8-bit Microcontroller, Up To 36k Bytes Of Sram And On-chip Jtag Ice
• Manufacturer: ATMEL Corporation

4.28.1
1138I–FPSLI–1/08
8-bit Multiplication
Table 4-24.
Doing an 8-bit multiply using the hardware multiplier is simple: just load the operands into two
registers (or only one for square multiply) and execute one of the multiply instructions. The result
will be placed in register pair R1:R0. However, note that only the MUL instruction does not have
register usage restrictions.
multiply instructions.
8-bit x 8-bit Routines:
Unsigned Multiply 8 x 8 = 16 bits
Signed Multiply 8 x 8 = 16 bits
Fractional Signed/Unsigned Multiply 8 x 8 = 16 bits
Fractional Signed Multiply-accumulate 8 x 8 + = 16 bits
16-bit x 16-bit Routines:
Signed/Unsigned Multiply 16 x 16 = 32 bits
UnSigned Multiply 16 x 16 = 32 bits
Signed Multiply 16 x 16 = 32 bits
Signed Multiply-accumulate 16 x 16 + = 32 bits
Fractional Signed Multiply 16 x 16 = 32 bits
Fractional Signed Multiply-accumulate 16 x 16 + = 32 bits
Performance Summary
Figure 4-36
shows the valid (operand) register usage for each of the
AT94KAL Series FPSLIC
Word (Cycles)
Word (Cycles)
13 (17)
15 (19)
19 (23)
16 (20)
21 (25)
1 (2)
1 (2)
1 (2)
3 (4)
6 (9)
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