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ST7LITEUS5 数据表(PDF) 40 Page - STMicroelectronics |
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ST7LITEUS5 数据表(HTML) 40 Page - STMicroelectronics |
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40 / 136 page  Obsolete Product(s) - Obsolete Product(s) Obsolete Product(s) - Obsolete Product(s) Interrupts ST7LITEUS2, ST7LITEUS5 40/136 7.2 External interrupts External interrupt vectors can be loaded into the PC register if the corresponding external interrupt occurred and if the I bit is cleared. These interrupts allow the processor to leave the Halt low power mode. The external interrupt polarity is selected through the miscellaneous register or interrupt register (if available). An external interrupt triggered on edge will be latched and the interrupt request automatically cleared upon entering the interrupt service routine. Caution: The type of sensitivity defined in the Miscellaneous or Interrupt register (if available) applies to the ei source. In case of a NANDed source (as described in the I/O ports section), a low level on an I/O pin, configured as input with interrupt, masks the interrupt request even in case of rising-edge sensitivity. 7.3 Peripheral interrupts Different peripheral interrupt flags in the status register are able to cause an interrupt when they are active if both: ● The I bit of the CC register is cleared. ● The corresponding enable bit is set in the control register. If any of these two conditions is false, the interrupt is latched and thus remains pending. Clearing an interrupt request is done by: ● Writing “0” to the corresponding bit in the status register or ● Access to the status register while the flag is set followed by a read or write of an associated register. Note: The clearing sequence resets the internal latch. A pending interrupt (that is, waiting for being enabled) will therefore be lost if the clear sequence is executed. Figure 14. Interrupt processing flowchart I BIT SET? Y N IRET? Y N FROM RESET LOAD PC FROM INTERRUPT VECTOR STACK PC, X, A, CC SET I BIT FETCH NEXT INSTRUCTION EXECUTE INSTRUCTION THIS CLEARS I BIT BY DEFAULT RESTORE PC, X, A, CC FROM STACK INTERRUPT Y N PENDING? Obsolete Product(s) - Obsolete Product(s) |
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