MC68340 datasheet(138/441 Pages) FREESCALE

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MOTOROLA

MC68340 USER’S MANUAL

5- 1

SECTION 5

CPU32

The CPU32, the first-generation instruction processing module of the M68300 family, is

based on the industry-standard MC68000 core processor. It has many features of the

MC68010 and MC68020 as well as unique features suited for high-performance processor

applications. The CPU32 provides a significant performance increase over the MC68000

CPU, yet maintains source-code and binary-code compatibility with the M68000 family.

5.1 OVERVIEW

The CPU32 is designed to interface to the intermodule bus (IMB), allowing interaction with

other IMB submodules. In this manner, integrated processors can be developed that

contain useful peripherals on chip. This integration provides high-speed accesses among

the IMB submodules, increasing system performance.

Another advantage of the CPU32 is low power consumption. The CPU32 is implemented

in high-speed complementary metal-oxide semiconductor (HCMOS) technology, providing

low power use during normal operation. During periods of inactivity, the LPSTOP

instruction can be executed, shutting down the CPU32 and other IMB modules, greatly

reducing power consumption.

Ease of programming is an important consideration when using an integrated processor.

The CPU32 instruction format reflects a predominate register-memory interaction

philosophy. All data resources are available to all operations that require them. The

programming model includes eight multifunction data registers and seven general-purpose

addressing registers. The data registers readily support 8-bit (byte), 16-bit (word), and 32-

bit (long-word) operand lengths for all operations. Address manipulation is supported by

word and long-word operations. Although the program counter (PC) and stack pointers

(SP) are special-purpose registers, they are also available for most data addressing

activities. Ease of program checking and diagnosis is enhanced by trace and trap

capabilities at the instruction level.

As processor applications become more complex and programs become larger, high-level

language (HLL) will become the system designer's choice in programming languages.

HLL aids in the rapid development of complex algorithms with less error and is readily

portable. The CPU32 instruction set will efficiently support HLL.

Freescale Semiconductor, Inc.

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