ALU and Accumulator Operations
ALU and Accumulator Operations
ALU and Accumulator
ALU and Barrel Shifter
ACC
AH (31-16)
AL (15-0)
AH.MSB
AH.LSB AL.MSB AL.LSB
16/32 data mem,
16/32 bit registers
Product (32)
MUX
ST0, ST1
8/16 Imm
One of the major components in the execution unit is the Arithmetic-Logical-Unit (ALU). To
support the traditional Digital Signal Processing (DSP) operation, the ALU also has the zero
cycle barrel shifter and the Accumulator. The enhancement that the C28x has is the additional
data paths added form the ALU to all internal CPU registers and data memory. The connection to
all internal registers helps the compiler to generate efficient C code. The data path to memory
allows the C28x performs single atomic instructions read-modify-write to the memory.
The following slides introduce you to various instructions that use the ALU hardware. Word,
byte, and long word 32-bit operation are supported.
C - 6 C28x - Appendix C - Assembly Programming
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