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鍙冩暩(sh霉)璩囨枡
鍨嬭櫉锛� MC68HRC908JK3CDW
寤犲晢锛� Freescale Semiconductor
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Break Module (BREAK)
Technical Data
MC68H(R)C908JL3 鈥� Rev. 1.1
184
Break Module (BREAK)
Freescale Semiconductor
17.3 Features
Features of the break module include the following:
Accessible I/O registers during the break Interrupt
CPU-generated break interrupts
Software-generated break interrupts
COP disabling during break interrupts
17.4 Functional Description
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:
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.
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 17-1 shows the structure of the break module.
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