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| 型號： | COP8-PGMA-44QFP |
| 廠商： | National Semiconductor |
| 文件頁數(shù)： | 25/62頁 |
| 文件大?。?/td> | 0K |
| 描述： | PROGRAMMING ADAPTER |
| 標準包裝： | 1 |
| 附件類型： | 編程適配器 |
| 適用于相關產(chǎn)品： | Cop 8 |
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9.0 Interrupts (Continued)
9.3.1 VIS Execution
When the VIS instruction is executed it activates the arbitra-
tion logic. The arbitration logic generates an even number
between E0 and FE (E0, E2, E4, E6 etc...) depending on
which active interrupt has the highest arbitration ranking at
the time of the 1st cycle of VIS is executed. For example, if
the software trap interrupt is active, FE is generated. If the
external interrupt is active and the software trap interrupt is
not, then FA is generated and so forth. If the only active
interrupt is software trap, than E0 is generated. This number
replaces the lower byte of the PC. The upper byte of the PC
remains unchanged. The new PC is therefore pointing to the
vector of the active interrupt with the highest arbitration
ranking. This vector is read from program memory and
placed into the PC which is now pointed to the 1st instruction
of the service routine of the active interrupt with the highest
arbitration ranking.
Figure 22 illustrates the different steps performed by the VIS
instruction.
Figure 23 shows a flowchart for the VIS instruc-
tion.
The non-maskable interrupt pending flag is cleared by the
RPND (Reset Non-Maskable Pending Bit) instruction (under
certain conditions) and upon RESET.
DS012838-29
FIGURE 22. VIS Operation
COP8SA
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| COP8-PGMA-48TF1 | 功能描述:插座和適配器 PROGRAMMING ADAPTER FOR 48TSSOP RoHS:否 制造商:Silicon Labs 產(chǎn)品:Adapter 用于:EM35x |
| COP8-PGMA-49AF1 | 功能描述:插座和適配器 COP8TA PROGR. ADAPTOR RoHS:否 制造商:Silicon Labs 產(chǎn)品:Adapter 用于:EM35x |
| COP8-PGMA-56TF1 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:8-Bit CMOS Flash Microcontroller with 8k Memory, Dual Op Amps, Virtual EEROM, Temperature Sensor,10-Bit A/D and Brownout Reset |
| COP8-PGMA-68P | 制造商:Texas Instruments 功能描述: |
| COP8-PGMA-68PF1 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:8-Bit CMOS Flash Microcontroller with 8k Memory, Dual Op Amps, Virtual EEROM, Temperature Sensor,10-Bit A/D and Brownout Reset |
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