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Chapter 16
In-Circuit Emulation
This chapter describes the in-circuit emulation (ICE) module of the MC68VZ328 and provides detailed
information about its operation and registers. The ICE module is designed to support low-cost emulator
designs using the MC68VZ328 microprocessor. Using four interface signals that are extended to external
pins, the ICE module has access to the 68000 CPU resources, with minimal restrictions. The features of the
in-circuit emulation module are as follows:
•
Dedicated chip-select for emulator debug monitor (using the EMUCS signal)
•
Dedicated level 7 interrupt for in-circuit emulation
•
One address signal comparator and one control signal comparator with masking to support single
or multiple hardware execution and bus breakpoints
•
One breakpoint instruction insertion unit
Figure 16-1 illustrates the block diagram of the in-circuit emulation module.
Internal CPU Bus
Figure 16-1. In-Circuit Emulation Module Block Diagram
Breakpoint
Insertion
Unit
Breakpoint
BBIRG
Detection
BRKIRQ
Emulator
Signal
Decoder
Interrupt
IRQ7
Controller
In-Circuit Emulation
External D[15:0]
EMUBRK
EMUCS
P/D
Interrupt
Gate
EMUIRQ
Module
16-1
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