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Indirect Port Addressing

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Zilog Z8000 microprocessor family
direct port addressing capability
16 bit port address is part of the instruction
indirect port addressing capability referencing one of the 16-bit general purpose registers, which contains the port address.

How many ports can the Z8000 address in each I/O addressing mode?

1?
2^16?
32768?

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Solution Summary

Zilog Z8000 microprocessor family
direct port addressing capability
16 bit port address is part of the instruction
indirect port addressing capability referencing one of the 16-bit general purpose registers, which contains the port address.

How many ports can the Z8000 address in each I/O addressing mode?

Solution Preview

With 3 bits, you can access 2^3 addresses.

Similarly here, you have 16 bits in the general purpose registers, which are used in the indirect addressing mode to address the ...

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