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15. The AVR Microcontrollers > 15.6. Bus Interfacing

Bus Interfacing

In this section, I’ll show you how to expand the capabilities of your processor by interfacing it to bus-based memories and peripherals. Different processor architectures have different signals and different timing, but once you understand one, the basic principles can be applied to all. Since most small microcontrollers don’t have external buses, the choice is very limited. We’ll look at the one, and only, AVR with an external bus—the AT90S8515. In the PIC world, the PIC17C44 is capable of bus-based interfacing.

A 2M DataFlash interfaced to an AT90S4434
Figure 15-11. A 2M DataFlash interfaced to an AT90S4434

AT90S8515 Memory Cycle

A memory cycle (also known as a machine cycle or


  

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