Datasheet

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Section 7 User Break Controller (UBC)
7.1 Overview
The user break controller (UBC) provides functions that simplify program debugging. Break
conditions are set in the UBC and a user break interrupt is generated according to the conditions of
the bus cycle generated by the CPU, DMAC, or DTC. This function makes it easy to design an
effective self-monitoring debugger, enabling the chip to easily debug programs without using a
large in-circuit emulator.
7.1.1 Features
The features of the user break controller are:
• Break compare conditions can be set:
 Address
 CPU cycle or DMA/DTC cycle
 Instruction fetch or data access
 Read or write
 Operand size: byte/word/longword
• User break interrupt generated upon satisfying break conditions. A user-designed user break
interrupt exception processing routine can be run.
• Select either to break in the CPU instruction fetch cycle before the instruction is executed or
after.
7.1.2 Block Diagram
Figure 7.1 shows a block diagram of the UBC.