Components of the CPU
1-6
1.2.3 Signals
The CPU has four main types of signals:
- Memory-interface signals. These signals transfer data among the CPU,
memory, and peripherals; indicate program-memory accesses and data-
memory accesses; and differentiate between accesses of different sizes
(16-bit or 32-bit).
- Clock and control signals. These provide clocking for the CPU and the
emulation logic, and they are used to control and monitor the CPU.
- Reset and interrupt signals. These are used for generating a hardware re-
set and interrupts, and for monitoring the status of interrupts.
- Emulation signals. These signals are used for testing and debugging.
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