TMS320F28030_16 Datasheet, PDF (40/160 Pages) Texas Instruments – Piccolo Microcontrollers

TMS320F28030, TMS320F28031, TMS320F28032
TMS320F28033, TMS320F28034, TMS320F28035
SPRS584K – APRIL 2009 – REVISED JUNE 2016
www.ti.com
6 Detailed Description
6.1 Overview
6.1.1 CPU
The 2803x (C28x) family is a member of the TMS320C2000™ microcontroller (MCU) platform. The C28x-
based controllers have the same 32-bit fixed-point architecture as existing C28x MCUs. It is a very
efficient C/C++ engine, enabling users to develop not only their system control software in a high-level
language, but also enabling development of math algorithms using C/C++. The device is as efficient at
MCU math tasks as it is at system control tasks that typically are handled by microcontroller devices. This
efficiency removes the need for a second processor in many systems. The 32 x 32-bit MAC 64-bit
processing capabilities enable the controller to handle higher numerical resolution problems efficiently.
Add to this the fast interrupt response with automatic context save of critical registers, resulting in a device
that is capable of servicing many asynchronous events with minimal latency. The device has an 8-level-
deep protected pipeline with pipelined memory accesses. This pipelining enables it to execute at high
speeds without resorting to expensive high-speed memories. Special branch-look-ahead hardware
minimizes the latency for conditional discontinuities. Special store conditional operations further improve
performance.
6.1.2 Control Law Accelerator (CLA)
The C28x control law accelerator is a single-precision (32-bit) floating-point unit that extends the
capabilities of the C28x CPU by adding parallel processing. The CLA is an independent processor with its
own bus structure, fetch mechanism, and pipeline. Eight individual CLA tasks, or routines, can be
specified. Each task is started by software or a peripheral such as the ADC, an ePWM, or CPU Timer 0.
The CLA executes one task at a time to completion. When a task completes the main CPU is notified by
an interrupt to the PIE and the CLA automatically begins the next highest-priority pending task. The CLA
can directly access the ADC Result registers and the ePWM+HRPWM registers. Dedicated message
RAMs provide a method to pass additional data between the main CPU and the CLA.
6.1.3 Memory Bus (Harvard Bus Architecture)
As with many MCU-type devices, multiple busses are used to move data between the memories and
peripherals and the CPU. The memory bus architecture contains a program read bus, data read bus, and
data write bus. The program read bus consists of 22 address lines and 32 data lines. The data read and
write busses consist of 32 address lines and 32 data lines each. The 32-bit-wide data busses enable
single cycle 32-bit operations. The multiple bus architecture, commonly termed Harvard Bus, enables the
C28x to fetch an instruction, read a data value and write a data value in a single cycle. All peripherals and
memories attached to the memory bus prioritize memory accesses. Generally, the priority of memory bus
accesses can be summarized as follows:
Highest:
Lowest:
Data Writes
Program Writes
Data Reads
Program Reads
Fetches
(Simultaneous data and program writes cannot occur on the
memory bus.)
(Simultaneous data and program writes cannot occur on the
memory bus.)
(Simultaneous program reads and fetches cannot occur on the
memory bus.)
(Simultaneous program reads and fetches cannot occur on the
memory bus.)
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Detailed Description
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