MC68HC908AZ32ACFU MOTOROLA [Motorola, Inc], MC68HC908AZ32ACFU Datasheet - Page 170
MC68HC908AZ32ACFU
Manufacturer Part Number
MC68HC908AZ32ACFU
Description
Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908AZ32ACFU.pdf
(468 pages)
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Break Module
11.4 Functional Description
Advance Information
170
When the internal address bus matches the value written in the break
address registers, the break module issues a breakpoint signal to the
CPU. The CPU then loads 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,
IAB[15:0]
A CPU-generated address (the address in the program counter)
matches the contents of the break address registers.
Software writes a logic 1 to the BRKA bit in the break status and
control register.
Figure 11-1
Go to: www.freescale.com
Figure 11-1. Break Module Block Diagram
IAB[15:8]
IAB[7:0]
Break Module
BREAK ADDRESS REGISTER HIGH
BREAK ADDRESS REGISTER LOW
shows the structure of the break module.
8-BIT COMPARATOR
8-BIT COMPARATOR
68HC908AZ32A — Rev 0.0
CONTROL
MOTOROLA
BREAK
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