PIC uc Latency Time Explained

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In summary, the graph shows a latency time diagram when an interrupt request occurs in a microcontroller. The microcontroller in the third machine cycle does not call the address "0004h" directly, possibly due to the use of a pipelined instruction and the need to save data before allowing the thread of execution to jump to another thread. However, the reason for this is not clear without further knowledge of the specific processor.
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MSI
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http://img521.imageshack.us/img521/6018/msi7cv.jpg

this graph shows a latency time diagram when an inturept request occur in a micro controller ..
i was just wondering why doesn't the micro controller in the third machine cycle call the address "0004h" directly ?
whats the use of this cycle ? ... still the micro controller can flush inst (PC+1) ,, while fetching 0004h in the next cycle ? :/
 
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Couple of possible reasons. First, many CPUs have a pipelines instruction. The instruction at PC + 1 is probably already decoded and execution may be difficult to stop and more effective to just let it complete. Second, the cpu may have to save some data before allowing the thread of excution to jump to another thread, such at status flags.

To better answer he question would require significant knowledge of that particular processor.
 
  • #3
well the second is not possibel , because saving the registers is done through the intrupt, and the first one .. yea it do pipelining (: , but it is already shown in the figer .. and if pc+1 is a calling function .. there will be extra latency (not shown in the figure) ..

anyway it is not a big deal (: , thanks
 

1. What is PIC uc latency time?

PIC uc latency time refers to the amount of time it takes for a PIC microcontroller to respond to an interrupt request. It is the delay between the request and the execution of the corresponding interrupt service routine.

2. Why is PIC uc latency time important?

PIC uc latency time is important because it determines the responsiveness and accuracy of the microcontroller's interrupt handling. If the latency time is too long, the microcontroller may miss important events or fail to respond in a timely manner.

3. How is PIC uc latency time measured?

PIC uc latency time is typically measured in clock cycles. This can vary depending on the specific PIC microcontroller and the system clock frequency. It can also be measured in terms of time, by calculating the number of clock cycles required to execute the interrupt service routine.

4. What factors can affect PIC uc latency time?

There are several factors that can affect PIC uc latency time, including the complexity of the interrupt service routine, the priority of the interrupt, and the presence of other interrupts or processes running at the same time. The hardware design and configuration of the microcontroller can also play a role.

5. How can I reduce PIC uc latency time?

To reduce PIC uc latency time, it is important to optimize the interrupt service routine and ensure that it is as efficient as possible. This may involve using hardware features such as interrupts with higher priority levels or optimizing the code for faster execution. It is also important to carefully design the system and avoid unnecessary interrupts or processes that could increase the latency time.

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