SPRAD88A march   2023  – april 2023 TMS320C28341 , TMS320C28342 , TMS320C28343 , TMS320C28343-Q1 , TMS320C28344 , TMS320C28345 , TMS320C28346 , TMS320C28346-Q1 , TMS320F28P550SJ , TMS320F28P559SJ-Q1

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
  4. 2Byte vs Word Terminology
  5. 3Key Points to Consider
    1. 3.1 8-Bit Data Types are not Supported
    2. 3.2 Memory Size is Expressed in 16 Bits
    3. 3.3 Arrays and Structures: Individual Element Offsets are Different
    4. 3.4 Difference in Standard Data Type Widths
    5. 3.5 Dealing With 8-Bit Communication Protocols
  6. 4References
  7. 5Revision History

1 Introduction

The TMS320C28x is one of several fixed-point CPUs in the TMS320™ family. It has a 16-bit addressable architecture compared to 8-bit addressable architecture like Arm® CPUs.

In a 8-bit addressable architecture, every 8 bits of data has a unique address, where as in a 16-bit addressable device , every 16 bits of data has a unique address. Hence, in a 16-bit architecture, the smallest addressable unit of memory and the smallest data type supported is 16 bits.