Motorola MC68VZ328 - Manual (Page 293)

In-Circuit Emulation 16-1
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.
Figure 16-1. In-Circuit Emulation Module Block Diagram
D[
15: 0]
A[31:
0]
EMUBRK
Cont
ro
l
Internal CPU Bus
EMUIRQ
Emulator
Decoder
EMUCS
Signal
Interrupt
Controller
IRQ7
Breakpoint
Detection
BRKIRQ
P/D
Interrupt
Gate
Module
Breakpoint
External D[15:0]
Insertion
Unit
BBIRG