Embedded Systems Design, 2nd Edition

16 Embedded systems design

8 bit accumulator processors

This category of processor first appeared in the mid-1970s

as the first microprocessors. Devices such as the 8080 from Intel

and the MC6800 from Motorola started the microprocessor revo-

lution. They provided about 1 MIP of performance and were at

their introduction the fastest processors available.

Register models

The programmer has a very simple register model for this

type of processor. The model for the Motorola MC6800 8 bit

processor is shown as an example but it is very representative of

the many processors that appeared (and subsequently vanished).

It has two 8 bit accumulators used for storing ...