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HCS12 bảng dữ liệu(PDF) 23 Page - Freescale Semiconductor, Inc

tên linh kiện HCS12
Giải thích chi tiết về linh kiện  HCS12 Microcontrollers
PDF  452 Pages
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nhà sản xuất  FREESCALE [Freescale Semiconductor, Inc]
Trang chủ  http://www.freescale.com
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HCS12 bảng dữ liệu(HTML) 23 Page - Freescale Semiconductor, Inc

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S12CPUV2 Reference Manual, Rev. 4.0
Freescale Semiconductor
23
loads the program counter with the previously stacked return address and
execution continues at that address.
When an interrupt occurs, the current instruction finishes execution. The
address of the next instruction is calculated and pushed onto the stack, all
the CPU registers are pushed onto the stack, the program counter is loaded
with the address pointed to by the interrupt vector, and execution continues
at that address. The stacked registers are referred to as an interrupt stack
frame. The CPU12 stack frame is the same as that of the M68HC11.
NOTE:
These instructions can be interrupted, and they resume execution once the
interrupt has been serviced:
• REV (fuzzy logic rule evaluation)
• REVW (fuzzy logic rule evaluation (weighted))
• WAV (weighted average)
2.2.4 Program Counter
The program counter (PC) is a 16-bit register that holds the address of the
next instruction to be executed. It is automatically incremented each time an
instruction is fetched.
2.2.5 Condition Code Register
The condition code register (CCR), named for its five status indicators,
contains:
• Five status indicators
• Two interrupt masking bits
• STOP instruction control bit



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