MC68HC908AP16CFA MOTOROLA [Motorola, Inc], MC68HC908AP16CFA Datasheet - Page 408
MC68HC908AP16CFA
Manufacturer Part Number
MC68HC908AP16CFA
Description
Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908AP16CFA.pdf
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Break Module (BRK)
23.3 Functional Description
Data Sheet
408
IAB15–IAB0
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.
Figure 23-1. Break Module Block Diagram
Freescale Semiconductor, Inc.
•
•
IAB15–IAB8
For More Information On This Product,
IAB7–IAB0
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.
BREAK ADDRESS REGISTER HIGH
BREAK ADDRESS REGISTER LOW
Figure 23-1
8-BIT COMPARATOR
8-BIT COMPARATOR
Go to: www.freescale.com
shows the structure of the break module.
CONTROL
MC68HC908AP Family — Rev. 2.5
BREAK
MOTOROLA
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