The PowerPC e300 is a family of 32-bit

32-bit

The range of integer values that can be stored in 32 bits is 0 through 4,294,967,295. Hence, a processor with 32-bit memory addresses can directly access 4 GB of byte-addressable memory....

 Power Architecture

Power Architecture

Power Architecture is a broad term to describe similar RISC instruction sets for microprocessors developed and manufactured by such companies as IBM, Freescale, AMCC, Tundra and P.A. Semi...

 microprocessor

Microprocessor

A microprocessor incorporates the functions of a computer's central processing unit on a single integrated circuit, or at most a few integrated circuits. It is a multipurpose, programmable device that accepts digital data as input, processes it according to instructions stored in its memory, and...

 cores developed by Freescale for primary use in system-on-a-chip

System-on-a-chip

A system on a chip or system on chip is an integrated circuit that integrates all components of a computer or other electronic system into a single chip. It may contain digital, analog, mixed-signal, and often radio-frequency functions—all on a single chip substrate...

 (SoC) designs with speed ranging up to 800 MHz, thus making them ideal for embedded applications

Embedded system

An embedded system is a computer system designed for specific control functions within a larger system. often with real-time computing constraints. It is embedded as part of a complete device often including hardware and mechanical parts. By contrast, a general-purpose computer, such as a personal...

.

The e300 is a superscalar

Superscalar

A superscalar CPU architecture implements a form of parallelism called instruction level parallelism within a single processor. It therefore allows faster CPU throughput than would otherwise be possible at a given clock rate...

 RISC core with 16/16 or 32/32 kB L1 data/instruction caches, a four stage pipeline

Instruction pipeline

An instruction pipeline is a technique used in the design of computers and other digital electronic devices to increase their instruction throughput ....

 with load/store, system register, branch prediction

Branch predictor

In computer architecture, a branch predictor is a digital circuit that tries to guess which way a branch will go before this is known for sure. The purpose of the branch predictor is to improve the flow in the instruction pipeline...

 and integer unit

Arithmetic logic unit

In computing, an arithmetic logic unit is a digital circuit that performs arithmetic and logical operations.The ALU is a fundamental building block of the central processing unit of a computer, and even the simplest microprocessors contain one for purposes such as maintaining timers...

 with optional double precision

Double precision

In computing, double precision is a computer number format that occupies two adjacent storage locations in computer memory. A double-precision number, sometimes simply called a double, may be defined to be an integer, fixed point, or floating point .Modern computers with 32-bit storage locations...

 FPU

Floating point unit

A floating-point unit is a part of a computer system specially designed to carry out operations on floating point numbers. Typical operations are addition, subtraction, multiplication, division, and square root...

.
The e300 core is not compatible with the latest Power ISA but adheres to the earlier PowerPC

PowerPC

PowerPC is a RISC architecture created by the 1991 Apple–IBM–Motorola alliance, known as AIM...

 specification and is completely backwards compatible with the G2 and PowerPC 603e cores from which it derives.

The e300 core is the CPU part of several SoC processors from Freescale:

• The MPC83xx PowerQUICC II Pro family of telecom and network processors.
• The MPC51xx and MPC52xx family of automotive and industrial control processors.
• MSC7120 GPON, optical network processor integrated DSP
  Digital signal processor
  A digital signal processor is a specialized microprocessor with an architecture optimized for the fast operational needs of digital signal processing.-Typical characteristics:...
  
  unit.http://www.freescale.com/files/optical_networking/doc/fact_sheet/MSC7120GPONFS.pdf