Appendix A: 8051 Introduction
A.1
Introduction
The EZ-USB contains an 8051 core that is binary compatible with the industry standard 8051
instruction set. This appendix provides an overview of the 8051 core features. the topics are:
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New 8051 Features
Performance Overview
Software Compatibility
803x/805x Feature Comparison
8051/DS80C320 Differences
A.2
8051 Features
The 8051 core provides the following design features and enhancements to the standard 8051
micro-controller:
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Compatible with industry standard 803x/805x:
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Standard 8051 instruction set
Two full-duplex serial ports
Three timers
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High speed architecture:
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4 clocks/instruction cycle
2.5X average improvement in instruction execution time over the standard 8051
Runs DC to 25-MHz clock
Wasted bus cycles eliminated
Dual data pointers
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256 Bytes internal data RAM
High-speed external memory interface with 16-bit address bus
Variable length MOVXto access fast/slow RAM peripherals
Fully static synchronous design
Supports industry standard compilers, assemblers, emulators, and ROM monitors
EZ-USB TRM v1.9
Appendix A: 8051 Introduction
A - 1
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