at94k10al ATMEL Corporation, at94k10al Datasheet - Page 128

• 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

4.28.7.7
128
AT94KAL Series FPSLIC
Comment on Implementations
All 16-bit x 16-bit = 32-bit functions implemented here start by clearing the R2 register, which is
just used as a “dummy” register with the “add with carry” (ADC) and “subtract with carry” (SBC)
operations. These operations do not alter the contents of the R2 register. If the R2 register is not
used elsewhere in the code, it is not necessary to clear the R2 register each time these functions
are called, but only once prior to the first call to one of the functions.
add
fmulsu
fmuls r23, r21
movw
fmul
adc
adc
adc
adc
sbc
add
adc
adc
fmulsu
sbc
add
adc
adc
ret
r16, r0
r5:r4,r1:r0
r22, r20
r4, r2
r17, r1
r18, r4
r19, r5
r23, r20
r19, r2
r17, r0
r18, r1
r19, r2
r19, r2
r17, r0
r18, r1
r19, r2
r21, r22
; ( (signed)ah * (signed)bh ) << 1
; ( al * bl ) << 1
; ( (signed)ah * bl ) << 1
; ( (signed)bh * al ) << 1
1138I–FPSLI–1/08