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| 型號(hào)： | NS32FX16-15 |
| 廠(chǎng)商： | National Semiconductor Corporation |
| 英文描述： | FILM/M CAPACITANCE=0.001 VOLT=630 |
| 中文描述： | 影像/信號(hào)處理器 |
| 文件頁(yè)數(shù)： | 31/88頁(yè) |
| 文件大?。?/td> | 902K |
| 代理商： | NS32FX16-15 |
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3.0 Functional Description
(Continued)
TL/EE/10818–16
FIGURE 3-7. Return from Interrupt (RETI) Instruction Flow
3.2.3.2 Vectored Mode: Non-Cascaded Case
In the Vectored mode, the CPU uses an Interrupt Control
Unit (ICU) to prioritize up to 16 interrupt requests. Upon re-
ceipt of an interrupt request on the INT pin, the CPU per-
forms an ‘‘Interrupt Acknowledge, Master’’ bus cycle read-
ing a vector value from the low-order byte of the Data Bus.
This vector is then used as an index into the Dispatch Table
in order to find the External Procedure Descriptor for the
proper interrupt service procedure. The service procedure
eventually returns via the Return from Interrupt (RETI) in-
struction, which performs an End of Interrupt bus cycle, in-
forming the ICU that it may re-prioritize any interrupt re-
quests still pending. The ICU provides the vector number
again, which the CPU uses to determine whether it needs
also to inform a Cascaded ICU.
In a system with only one ICU (16 levels of interrupt), the
vectors provided must be in the range of 0 through 127; that
is, they must be positive numbers in eight bits. By providing
a negative vector number, an ICU flags the interrupt source
as being a Cascaded ICU (see below).
Note:
During a return from interrupt, the CPU looks at Bit 7 of the vector
number from the master ICU. If Bit 7 is 0, bits 0 through 6 are ignored.
3.2.3.3 Vectored Mode: Cascaded Case
In order to allow up to 256 levels of interrupt, provision is
made both in the CPU and in the NS32202 Interrupt Control
31
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| NS32FX16-20 | Imaging/Signal Processor |
| NS32FX16-25 | Imaging/Signal Processor |
| NS32FX164-20 | Advanced Imaging/Communication Signal Processors(高級(jí)圖象/通訊信號(hào)處理器) |
| NS32FV16-25 | Advanced Imaging/Communication Signal Processors |
| NS32FX164-25 | Advanced Imaging/Communication Signal Processors(高級(jí)圖象/通訊信號(hào)處理器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NS32FX16-20 | 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:Imaging/Signal Processor |
| NS32FX16-25 | 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:Imaging/Signal Processor |
| NS32FX164 | 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述: |
| NS32FX164-20 | 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:Advanced Imaging/Communication Signal Processors |
| NS32FX164-25 | 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:Advanced Imaging/Communication Signal Processors |
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