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I/o space – Zilog EZ80F916 User Manual

Page 56

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eZ80

®

CPU

User Manual

UM007715-0415

I/O Space

47

I/O Space

A separate I/O space may include both on- and off-chip peripheral devices. The eZ80

®

CPU is capable of addressing a 64 KB I/O space with 16-bit addresses. The memory and I/

O space share the same 24-bit address and 8-bit data buses. However, the I/O peripherals

are accessed using special I/O instructions including IN, OUT, and TSTIO. Whenever an

I/O instruction is executed the upper byte of the 24-bit address bus is undefined.
Refer to the eZ80

®

and eZ80Acclaim!

®

product specifications

for more information on

using the I/O address space and the on-chip I/O peripherals.

This manual is related to the following products: