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HCS12 数据表(PDF) 321 Page - Freescale Semiconductor, Inc

部件名 HCS12
功能描述  HCS12 Microcontrollers
PDF  452 Pages
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制造商  FREESCALE [Freescale Semiconductor, Inc]
网页  http://www.freescale.com
标志 FREESCALE - Freescale Semiconductor, Inc

HCS12 数据表(HTML) 321 Page - Freescale Semiconductor, Inc

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S12CPUV2 Reference Manual, Rev. 4.0
Freescale Semiconductor
321
• Cycle 8.1/8.2 pushes the 8-bit CCR onto the stack, then updates the
mask bits.
–
When an XIRQ interrupt causes an exception, both X and I are set,
which inhibits further interrupts during exception processing.
–
When any other interrupt causes an exception, the I bit is set, but
the X bit is not changed.
• Cycle 9.1/9.2 is the third of three program word fetches that refill the
instruction queue. It is the last cycle of exception processing. After this
cycle the CPU starts executing the first cycle of the instruction at the
head of the instruction queue.



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