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鍙冩暩(sh霉)璩囨枡
鍨嬭櫉(h脿o)锛� MC908JB16FAE
寤犲晢锛� Freescale Semiconductor
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鐢�(ch菐n)鍝佺洰閷勯爜(y猫)闈細 725 (CN2011-ZH PDF)
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Break Module (BRK)
Technical Data
MC68HC908JB16 鈥� Rev. 1.1
308
Break Module (BRK)
Freescale Semiconductor
19.3 Features
Features of the break module include:
Accessible input/output (I/O) registers during the break interrupt
CPU-generated break interrupts
Software-generated break interrupts
COP disabling during break interrupts
19.4 Functional Description
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:
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.
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 19-1 shows the structure of the break module.
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