MC68HC908JL8 MOTOROLA [Motorola, Inc], MC68HC908JL8 Datasheet - Page 260

• Manufacturer Part Number: MC68HC908JL8
• Description: Motorola reserves the right to make changes without further notice to any products herein
• Manufacturer: MOTOROLA [Motorola, Inc]

Break Module (BREAK)
18.3 Features
18.4 Functional Description
Technical Data
260
Features of the break module include the following:
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.
Freescale Semiconductor, Inc.
•
•
•
•
•
•
For More Information On This Product,
Accessible I/O registers during the break Interrupt
CPU-generated break interrupts
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 logic one to the BRKA bit in the break status and
control register.
Figure 18-1
Go to: www.freescale.com
Break Module (BREAK)
shows the structure of the break module.
MC68HC908JL8
MOTOROLA
—
Rev. 2.0