The eZ80 Webserver

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THE eZ80 WEBSERVER

Technically Speaking An 8-Bit CPU Takes on the Internet

by James Antonakos

Start ı Software Model ı Memory Map ı Instruction Set ı On-Chip Peripheral Registers ı Hardware Architecture ı TCP/IP Stack Operation ı eZ80 Evaluation Board ı Connecting the System ı Developing the Hardware and Software ı Application: A Web-Based Security System ı Other Applications ı Win Your Own! ı Sources and PDF

HARDWARE ARCHITECTURE

The eZ80 comes in a surface mount 100-pin low-profile quad flat pack (LQFP). Figure 3 shows the pin numbering and signal assignments. Make note of the large number of pins required for an 8-bit microprocessor.

(click here to enlarge)

Figure 3ıHere you can see a 100-pin LQFP diagram of the eZ80 Webserver CPU.

What are they all for? As I mentioned at the beginning of this article, the eZ80 is loaded with a rich supply of on-chip peripherals. Examine Figure 4, which shows an internal diagram of the eZ80 Webserver. The numerous on-chip peripherals require many off-chip connections, hence the large number of pins in the eZ80 package.

(click here to enlarge)

Figure 4ıHere is the internal architecture of the eZ80 CPU.

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