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ATPL00B Datasheet(PDF) 43 Page - ATMEL Corporation |
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ATPL00B Datasheet(HTML) 43 Page - ATMEL Corporation |
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43 / 152 page  Atmel ATPL00B [datasheet] 43028A-ATPL - 9/12 43 When in operation mode, all the interrupt flags are latched into the interrupt control system during state 2 of every machine cycle. The samples are polled during the following machine cycle. If the flag for an enabled interrupt is found to be set („1‟), the interrupt system generates an LCALL to the appropriate location in Program Memory, unless some other condition blocks the interrupt. Several conditions can block an interrupt, for example when an interrupt of equal or higher priority level is already in progress. The hardware-generated LCALL causes the value in the Program Counter to be pushed into the stack, and reloads the PC with the beginning address of the service routine. As previously noted the service routine for each interrupt begins at a fixed location. Only the Program Counter is automatically pushed onto the stack, not the PSW or any other register. Having only the PC automatically saved it is a programmer task to save other registers if necessary Figure 4-11. Interrupt Priorities diagram |
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