mc68hc908as60 Freescale Semiconductor, Inc, mc68hc908as60 Datasheet - Page 186
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mc68hc908as60
Manufacturer Part Number
mc68hc908as60
Description
Mc68hc908as60 Microcontroller
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC908AS60.pdf
(454 pages)
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Break Module
12.4 Functional Description
Technical Data
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).
These two 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 12-1
Go to: www.freescale.com
Figure 12-1. 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
MC68HC908AS60 — Rev. 1.0
CONTROL
BREAK
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