ST7LITEU05 datasheet(32/115 Pages) STMICROELECTRONICS

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INTERRUPTS (cont’d)

Figure 18. Interrupt Processing Flowchart

Table 10. Interrupt mapping

Notes:

1. This interrupt exits the MCU from “Auto Wake-up from HALT” mode only.

2. Whatever the sensitivity configuration, this interrupt cannot exit the MCU from HALT, ACTIVE-HALT and AWUFH

modes when a falling edge occurs.

3. This interrupt exits the MCU from “WAIT” and “ACTIVE-HALT” modes only. Moreover IS4[1:0] =01 is the only safe con-

figuration to avoid spurious interrupt in Halt and AWUFH modes.

4. These interrupts exit the MCU from “ACTIVE-HALT” mode only.

N°

Source

Block

Description

Label

Priority

Order

Exit

from

HALT

Address

Vector

RESET

Reset

N/A

Highest

Priority

Lowest

Priority

yes

FFFEh-FFFFh

TRAP

Software Interrupt

FFFCh-FFFDh

AWU

Auto Wakeup Interrupt

AWUCSR

yes 1)

FFFAh-FFFBh

ei0

External Interrupt 0

N/A

yes

FFF8h-FFF9h

ei1

External Interrupt 1

FFF6h-FFF7h

3 2)

ei2 2)

External Interrupt 22)

FFF4h-FFF5h

Not used

FFF2h-FFF3h

ei3

External Interrupt 3

yes

FFF0h-FFF1h

6 3)

ei4 3)

External Interrupt 4 3)

no 3)

FFEEh-FFEFh

AVD interrupt

SICSR

FFECh-FFEDh

AT TIMER

AT TIMER Output Compare Interrupt PWMxCSR or ATCSR

FFEAh-FFEBh

AT TIMER Overflow Interrupt

ATCSR

yes 4)

FFE8h-FFE9h

LITE TIMER

LITE TIMER Input Capture Interrupt

LTCSR

FFE6h-FFE7h

LITE TIMER RTC1 Interrupt

LTCSR

yes 4)

FFE4h-FFE5h

Not used

FFE2h-FFE3h

Not used

FFE0h-FFE1h

I BIT SET?

IRET?

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

PENDING?

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