MC68HC08AZ60ACFU MOTOROLA [Motorola, Inc], MC68HC08AZ60ACFU Datasheet - Page 172

• Manufacturer Part Number: MC68HC08AZ60ACFU
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

Break Module
11.4 Functional Description
Advance Information
172
When the internal address bus matches the value written in the break
address registers, the break module issues a breakpoint signal (BKPT)
to the SIM. The SIM then causes the CPU to load the instruction register
with a software interrupt instruction (SWI) after completion of the current
CPU instruction. The program counter vectors to $FFFC and $FFFD
($FEFC and $FEFD in monitor mode).
The following events can cause a break interrupt to occur:
When a CPU-generated address matches the contents of the break
address registers, the break interrupt begins after the CPU completes its
current instruction. A return from interrupt instruction (RTI) in the break
routine ends the break interrupt and returns the MCU to normal
operation.
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Software-generated break interrupts
COP disabling during break interrupts
A CPU-generated address (the address in the program counter)
matches the contents of the break address registers.
Software writes a ‘1’ to the BRKA bit in the break status and
control register (BRKSCR).
Figure 11-1
Break Module
shows the structure of the break module.
MC68HC08AZ60A — Rev 0.0
MOTOROLA