Texas Instruments C28 Series

C28x CPU
Special Instructions
C28x Atomic Read/Modify/Write
C28x Atomic Read/Modify/Write
Registers
Registers
ALU / MPY
ALU / MPY
LOAD
LOAD
STORE
STORE
WRITE
WRITE
READ
READ
CPU
CPU
Mem
Mem


Atomic Instructions Benefits:
Atomic Instructions Benefits:
¾
¾
Simpler programming
Simpler programming
¾
¾
Smaller, faster code
Smaller, faster code
¾
¾
Uninterruptible (Atomic)
Uninterruptible (Atomic)
¾
¾
More efficient compiler
More efficient compiler
AND *XAR2,#1234h
AND *XAR2,#1234h
2 words / 1 cycles
2 words / 1 cycles
Atomic Read/Modify/Write
Atomic Read/Modify/Write
MOV
MOV
AL,*XAR2
AL,*XAR2
AND
AND
AL,#1234h
AL,#1234h
MOV
MOV
*XAR2,AL
*XAR2,AL
DINT
DINT
EINT
EINT
6 words / 6 cycles
6 words / 6 cycles
Standard Load/Store
Standard Load/Store
Atomics are small common instructions that are non-interuptable. The atomic ALU capability
supports instructions and code that manages tasks and processes. These instructions usually
execute several cycles faster than traditional coding.
C28x - Architecture Overview 1 - 7