mcf5282 Freescale Semiconductor, Inc, mcf5282 Datasheet - Page 90

• Manufacturer Part Number: mcf5282
• Manufacturer: Freescale Semiconductor, Inc

Enhanced Multiply-Accumulate Unit (EMAC)
Executing this sequence type can correctly save and restore the exact state of the EMAC programming
model.
3.3.1.3
MULS and MULU are unaffected by fractional-mode operation; operands remain assumed to be integers.
3.3.1.4
The scale factor is ignored while the MAC is in fractional mode.
3.3.2
Table 3-8
3-12
Multiply Signed
Multiply Unsigned
Multiply Accumulate
Multiply Accumulate
with Load
Load Accumulator
Store Accumulator
Copy Accumulator
Load MACSR
Store MACSR
Store MACSR to CCR
Load MAC Mask Reg
Store MAC Mask Reg
Load Accumulator
Extensions 01
Command
movem.l (a7),#0x00ff
move.l
move.l
move.l
move.l
move.l
move.l
move.l
move.l
move.l
summarizes EMAC unit instructions.
EMAC Instruction Set Summary
MULS/MULU
Scale Factor in MAC or MSAC Instructions
#0,macsr
d0,acc0
d1,acc1
d2,acc2
d3,acc3
d4,accext01
d5,accext23
d6,mask
d7,macsr
muls <ea>y,Dx
mulu <ea>y,Dx
mac Ry,RxSF,ACCx
msac Ry,RxSF,ACCx
mac
msac Ry,Rx,<ea>y,Rw,ACCx
move.l {Ry,#imm},ACCx
move.l ACCx,Rx
move.l ACCy,ACCx
move.l {Ry,#imm},MACSR
move.l MACSR,Rx
move.l MACSR,CCR
move.l {Ry,#imm},MASK
move.l MASK,Rx
move.l {Ry,#imm},ACCext01 Loads the accumulator 0,1 extension bytes with a 32-bit
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3
Ry,Rx,<ea>y,Rw,ACCx
Mnemonic
Table 3-8. EMAC Instruction Summary
; restore the state from memory
; disable rounding in the macsr
; restore the accumulators
; restore the accumulator extensions
; restore the address mask
; restore the macsr
Multiplies two signed operands yielding a signed result
Multiplies two unsigned operands yielding an unsigned result
Multiplies two operands and adds/subtracts the product
to/from an accumulator
Multiplies two operands and combines the product to an
accumulator while loading a register with the memory operand
Loads an accumulator with a 32-bit operand
Writes the contents of an accumulator to a CPU register
Copies a 48-bit accumulator
Writes a value to MACSR
Write the contents of MACSR to a CPU register
Write the contents of MACSR to the CCR
Writes a value to the MASK register
Writes the contents of the MASK to a CPU register
operand
Description
Freescale Semiconductor