ATPL00B datasheet(43/152 Pages) ATMEL

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Atmel ATPL00B [datasheet]

43028A-ATPL - 9/12

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

ATPL00B bảng dữ liệu(PDF) 43 Page - ATMEL Corporation