MC68340 datasheet(145/441 Pages) FREESCALE

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5- 8

MC68340 USER’S MANUAL

MOTOROLA

5.2 ARCHITECTURE SUMMARY

The CPU32 is upward source- and object-code compatible with the MC68000 and

MC68010. It is downward source- and object-code compatible with the MC68020. Within

the M68000 family, architectural differences are limited to the supervisory operating state.

User state programs can be executed unchanged on upward-compatible devices.

The major CPU32 features are as follows:

• 32-Bit Internal Data Path and Arithmetic Hardware

• 32-Bit Address Bus Supported by 32-Bit Calculations

• Rich Instruction Set

• Eight 32-Bit General-Purpose Data Registers

• Seven 32-Bit General-Purpose Address Registers

• Separate User and Supervisor Stack Pointers

• Separate User and Supervisor State Address Spaces

• Separate Program and Data Address Spaces

• Many Data Types

• Flexible Addressing Modes

• Full Interrupt Processing

• Expansion Capability

5.2.1 Programming Model

The CPU32 programming model consists of two groups of registers that correspond to the

user and supervisor privilege levels. User programs can only use the registers of the user

model. The supervisor programming model, which supplements the user programming

model, is used by CPU32 system programmers who wish to protect sensitive operating

system functions. The supervisor model is identical to that of MC68010 and later

processors.

The CPU32 has eight 32-bit data registers, seven 32-bit address registers, a 32-bit PC,

separate 32-bit SSP and USP, a 16-bit SR, two alternate function code registers, and a

32-bit VBR (see Figures 5-3 and 5-4).

Freescale Semiconductor, Inc.

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MC68340 Datasheet(PDF) 145 Page - Freescale Semiconductor, Inc