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C167CS bảng dữ liệu(PDF) 102 Page - Infineon Technologies AG

tên linh kiện C167CS
Giải thích chi tiết về linh kiện  16-Bit Single-Chip Microcontroller
PDF  517 Pages
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nhà sản xuất  INFINEON [Infineon Technologies AG]
Trang chủ  http://www.infineon.com
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C167CS bảng dữ liệu(HTML) 102 Page - Infineon Technologies AG

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C167CS
Derivatives
Interrupt and Trap Functions
User’s Manual
5-19
V2.0, 2000-07
Context Switching
An interrupt service routine usually saves all the registers it uses on the stack, and
restores them before returning. The more registers a routine uses, the more time is
wasted with saving and restoring. The C167CS allows to switch the complete bank of
CPU registers (GPRs) with a single instruction, so the service routine executes within its
own, separate context.
The instruction “SCXT CP, #New_Bank” pushes the content of the context pointer (CP)
on the system stack and loads CP with the immediate value “New_Bank”, which selects
a new register bank. The service routine may now use its “own registers”. This register
bank is preserved, when the service routine terminates, i.e. its contents are available on
the next call.
Before returning (RETI) the previous CP is simply POPped from the system stack, which
returns the registers to the original bank.
Note: The first instruction following the SCXT instruction must not use a GPR.
Resources that are used by the interrupting program must eventually be saved and
restored, e.g. the DPPs and the registers of the MUL/DIV unit.



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