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參數(shù)資料
| 型號： | D950-CORE |
| 廠商： | 意法半導體 |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | 16-Bit Fixed Point Digital Signal Processor DSP Core |
| 中文描述： | 16位定點數(shù)字信號處理器DSP核 |
| 文件頁數(shù)： | 24/89頁 |
| 文件大小： | 560K |
| 代理商： | D950-CORE |
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D950-Core
Immediate Data Addressing
This mode allows direct register loading. If the data is 16-bit long (see LR and LL bits of STA
register), this mode requires one word of instruction extension to store the data.
Immediate short data addressing is possible on 6-bit data, without instruction extension:
If AXi, AYi or STA are concerned, the 6 LSB’s are loaded from the instruction and the MSB’s
are unchanged. For all other registers, the MSB’s are fed with 0
Figure 4.10
Immediate Addressing
Stack operation addressing
16-bit Stack Pointer register SPX is available for X-memory space and SPY for Y-memory
space. It can be initialized to any value, provided it points to a stack dedicated memory area.
The stack size is limited to the available memory. No provision is taken to detect stack
overflows or underflows. After reset, the SP registers are not initialized.
The following addressing modes are possible with the 16-bit SP registers:
For the X and Y stack pointer registers: PUSH (SP pre-decrement) or POP (SP
post-increment) for register-to-stack move, memory-to-stack move and for
immediate value-to-stack move.
Double PUSH and double POP. In this operation, the PUSH or POP operation
is performed simultaneously on the X and Y stack point register. This is used in
a switching context.
For the X stack pointer register only: Indirect indexed addressing for register-
to-stack move.
register
value
VR02017I
5
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